Nested Class Summary

Field Summary

Constructor Summary

Method Summary

Field Details

• MIN_RADIX

  public static final int MIN_RADIX

  The minimum radix available for conversion to and from strings. The constant value of this field is the smallest value permitted for the radix argument in radix-conversion methods such as thedigit method, theforDigit method, and thetoString method of classInteger.

  See Also:

  • digit(char, int)
  • forDigit(int, int)
  • Integer.toString(int, int)
  • Integer.valueOf(String)
  • Constant Field Values

• MAX_RADIX

  public static final int MAX_RADIX

  The maximum radix available for conversion to and from strings. The constant value of this field is the largest value permitted for the radix argument in radix-conversion methods such as thedigit method, theforDigit method, and thetoString method of classInteger.

  See Also:

  • digit(char, int)
  • forDigit(int, int)
  • Integer.toString(int, int)
  • Integer.valueOf(String)
  • Constant Field Values

• MIN_VALUE

  public static final char MIN_VALUE

  The constant value of this field is the smallest value of typechar,'\u0000'.

  Since:

  1.0.2

  See Also:

  • Constant Field Values

• MAX_VALUE

  public static final char MAX_VALUE

  The constant value of this field is the largest value of typechar,'\uFFFF'.

  Since:

  1.0.2

  See Also:

  • Constant Field Values

• TYPE

  public static final Class<Character> TYPE

  TheClass instance representing the primitive typechar.

  Since:

  1.1

• UNASSIGNED

  public static final byte UNASSIGNED

  General category "Cn" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• UPPERCASE_LETTER

  public static final byte UPPERCASE_LETTER

  General category "Lu" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• LOWERCASE_LETTER

  public static final byte LOWERCASE_LETTER

  General category "Ll" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• TITLECASE_LETTER

  public static final byte TITLECASE_LETTER

  General category "Lt" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• MODIFIER_LETTER

  public static final byte MODIFIER_LETTER

  General category "Lm" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• OTHER_LETTER

  public static final byte OTHER_LETTER

  General category "Lo" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• NON_SPACING_MARK

  public static final byte NON_SPACING_MARK

  General category "Mn" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• ENCLOSING_MARK

  public static final byte ENCLOSING_MARK

  General category "Me" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• COMBINING_SPACING_MARK

  public static final byte COMBINING_SPACING_MARK

  General category "Mc" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• DECIMAL_DIGIT_NUMBER

  public static final byte DECIMAL_DIGIT_NUMBER

  General category "Nd" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• LETTER_NUMBER

  public static final byte LETTER_NUMBER

  General category "Nl" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• OTHER_NUMBER

  public static final byte OTHER_NUMBER

  General category "No" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• SPACE_SEPARATOR

  public static final byte SPACE_SEPARATOR

  General category "Zs" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• LINE_SEPARATOR

  public static final byte LINE_SEPARATOR

  General category "Zl" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• PARAGRAPH_SEPARATOR

  public static final byte PARAGRAPH_SEPARATOR

  General category "Zp" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• CONTROL

  public static final byte CONTROL

  General category "Cc" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• FORMAT

  public static final byte FORMAT

  General category "Cf" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• PRIVATE_USE

  public static final byte PRIVATE_USE

  General category "Co" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• SURROGATE

  public static final byte SURROGATE

  General category "Cs" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• DASH_PUNCTUATION

  public static final byte DASH_PUNCTUATION

  General category "Pd" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• START_PUNCTUATION

  public static final byte START_PUNCTUATION

  General category "Ps" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• END_PUNCTUATION

  public static final byte END_PUNCTUATION

  General category "Pe" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• CONNECTOR_PUNCTUATION

  public static final byte CONNECTOR_PUNCTUATION

  General category "Pc" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• OTHER_PUNCTUATION

  public static final byte OTHER_PUNCTUATION

  General category "Po" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• MATH_SYMBOL

  public static final byte MATH_SYMBOL

  General category "Sm" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• CURRENCY_SYMBOL

  public static final byte CURRENCY_SYMBOL

  General category "Sc" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• MODIFIER_SYMBOL

  public static final byte MODIFIER_SYMBOL

  General category "Sk" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• OTHER_SYMBOL

  public static final byte OTHER_SYMBOL

  General category "So" in the Unicode specification.

  Since:

  1.1

  See Also:

  • Constant Field Values

• INITIAL_QUOTE_PUNCTUATION

  public static final byte INITIAL_QUOTE_PUNCTUATION

  General category "Pi" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• FINAL_QUOTE_PUNCTUATION

  public static final byte FINAL_QUOTE_PUNCTUATION

  General category "Pf" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_UNDEFINED

  public static final byte DIRECTIONALITY_UNDEFINED

  Undefined bidirectional character type. Undefinedchar values have undefined directionality in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_LEFT_TO_RIGHT

  public static final byte DIRECTIONALITY_LEFT_TO_RIGHT

  Strong bidirectional character type "L" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_RIGHT_TO_LEFT

  public static final byte DIRECTIONALITY_RIGHT_TO_LEFT

  Strong bidirectional character type "R" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC

  public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC

  Strong bidirectional character type "AL" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_EUROPEAN_NUMBER

  public static final byte DIRECTIONALITY_EUROPEAN_NUMBER

  Weak bidirectional character type "EN" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR

  public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR

  Weak bidirectional character type "ES" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR

  public static final byte DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR

  Weak bidirectional character type "ET" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_ARABIC_NUMBER

  public static final byte DIRECTIONALITY_ARABIC_NUMBER

  Weak bidirectional character type "AN" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_COMMON_NUMBER_SEPARATOR

  public static final byte DIRECTIONALITY_COMMON_NUMBER_SEPARATOR

  Weak bidirectional character type "CS" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_NONSPACING_MARK

  public static final byte DIRECTIONALITY_NONSPACING_MARK

  Weak bidirectional character type "NSM" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_BOUNDARY_NEUTRAL

  public static final byte DIRECTIONALITY_BOUNDARY_NEUTRAL

  Weak bidirectional character type "BN" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_PARAGRAPH_SEPARATOR

  public static final byte DIRECTIONALITY_PARAGRAPH_SEPARATOR

  Neutral bidirectional character type "B" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_SEGMENT_SEPARATOR

  public static final byte DIRECTIONALITY_SEGMENT_SEPARATOR

  Neutral bidirectional character type "S" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_WHITESPACE

  public static final byte DIRECTIONALITY_WHITESPACE

  Neutral bidirectional character type "WS" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_OTHER_NEUTRALS

  public static final byte DIRECTIONALITY_OTHER_NEUTRALS

  Neutral bidirectional character type "ON" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING

  public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING

  Strong bidirectional character type "LRE" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE

  public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE

  Strong bidirectional character type "LRO" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING

  public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING

  Strong bidirectional character type "RLE" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE

  public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE

  Strong bidirectional character type "RLO" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

  public static final byte DIRECTIONALITY_POP_DIRECTIONAL_FORMAT

  Weak bidirectional character type "PDF" in the Unicode specification.

  Since:

  1.4

  See Also:

  • Constant Field Values

• DIRECTIONALITY_LEFT_TO_RIGHT_ISOLATE

  public static final byte DIRECTIONALITY_LEFT_TO_RIGHT_ISOLATE

  Weak bidirectional character type "LRI" in the Unicode specification.

  Since:

  9

  See Also:

  • Constant Field Values

• DIRECTIONALITY_RIGHT_TO_LEFT_ISOLATE

  public static final byte DIRECTIONALITY_RIGHT_TO_LEFT_ISOLATE

  Weak bidirectional character type "RLI" in the Unicode specification.

  Since:

  9

  See Also:

  • Constant Field Values

• DIRECTIONALITY_FIRST_STRONG_ISOLATE

  public static final byte DIRECTIONALITY_FIRST_STRONG_ISOLATE

  Weak bidirectional character type "FSI" in the Unicode specification.

  Since:

  9

  See Also:

  • Constant Field Values

• DIRECTIONALITY_POP_DIRECTIONAL_ISOLATE

  public static final byte DIRECTIONALITY_POP_DIRECTIONAL_ISOLATE

  Weak bidirectional character type "PDI" in the Unicode specification.

  Since:

  9

  See Also:

  • Constant Field Values

• MIN_HIGH_SURROGATE

  public static final char MIN_HIGH_SURROGATE

  The minimum value of a Unicode high-surrogate code unit in the UTF-16 encoding, constant'\uD800'. A high-surrogate is also known as aleading-surrogate.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MAX_HIGH_SURROGATE

  public static final char MAX_HIGH_SURROGATE

  The maximum value of a Unicode high-surrogate code unit in the UTF-16 encoding, constant'\uDBFF'. A high-surrogate is also known as aleading-surrogate.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MIN_LOW_SURROGATE

  public static final char MIN_LOW_SURROGATE

  The minimum value of a Unicode low-surrogate code unit in the UTF-16 encoding, constant'\uDC00'. A low-surrogate is also known as atrailing-surrogate.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MAX_LOW_SURROGATE

  public static final char MAX_LOW_SURROGATE

  The maximum value of a Unicode low-surrogate code unit in the UTF-16 encoding, constant'\uDFFF'. A low-surrogate is also known as atrailing-surrogate.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MIN_SURROGATE

  public static final char MIN_SURROGATE

  The minimum value of a Unicode surrogate code unit in the UTF-16 encoding, constant'\uD800'.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MAX_SURROGATE

  public static final char MAX_SURROGATE

  The maximum value of a Unicode surrogate code unit in the UTF-16 encoding, constant'\uDFFF'.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MIN_SUPPLEMENTARY_CODE_POINT

  public static final int MIN_SUPPLEMENTARY_CODE_POINT

  The minimum value of a Unicode supplementary code point, constantU+10000.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MIN_CODE_POINT

  public static final int MIN_CODE_POINT

  The minimum value of a Unicode code point, constantU+0000.

  Since:

  1.5

  See Also:

  • Constant Field Values

• MAX_CODE_POINT

  public static final int MAX_CODE_POINT

  The maximum value of a Unicode code point, constantU+10FFFF.

  Since:

  1.5

  See Also:

  • Constant Field Values

• SIZE

  public static final int SIZE

  The number of bits used to represent achar value in unsigned binary form, constant16.

  Since:

  1.5

  See Also:

  • Constant Field Values

• BYTES

  public static final int BYTES

  The number of bytes used to represent achar value in unsigned binary form.

  Since:

  1.8

  See Also:

  • Constant Field Values

Constructor Details

• Character

  @Deprecated(since="9",forRemoval=true)public Character(char value)

  Deprecated, for removal: This API element is subject to removal in a future version.

  It is rarely appropriate to use this constructor. The static factoryvalueOf(char) is generally a better choice, as it is likely to yield significantly better space and time performance.

  Constructs a newly allocatedCharacter object that represents the specifiedchar value.

  Parameters:

  value - the value to be represented by theCharacter object.

Method Details

• describeConstable

  public Optional<DynamicConstantDesc<Character>> describeConstable()

  Returns anOptional containing the nominal descriptor for this instance.

  Specified by:

  describeConstable in interface Constable

  Returns:

  anOptional describing theCharacter instance

  Since:

  15

• valueOf

  public static Character valueOf(char c)

  Returns aCharacter instance representing the specifiedchar value. If a newCharacter instance is not required, this method should generally be used in preference to the constructorCharacter(char), as this method is likely to yield significantly better space and time performance by caching frequently requested values. This method will always cache values in the range '\u0000' to'\u007F', inclusive, and may cache other values outside of this range.

  Parameters:

  c - a char value.

  Returns:

  aCharacter instance representingc.

  Since:

  1.5

• charValue

  public char charValue()

  Returns the value of thisCharacter object.

  Returns:

  the primitivechar value represented by this object.

• hashCode

  public int hashCode()

  Returns a hash code for thisCharacter; equal to the result of invokingcharValue().

  Overrides:

  hashCode in class Object

  Returns:

  a hash code value for thisCharacter

  See Also:

  • Object.equals(java.lang.Object)
  • System.identityHashCode(java.lang.Object)

• hashCode

  public static int hashCode(char value)

  Returns a hash code for achar value; compatible withCharacter.hashCode().

  Parameters:

  value - Thechar for which to return a hash code.

  Returns:

  a hash code value for achar value.

  Since:

  1.8

• equals

  public boolean equals(Object obj)

  Compares this object against the specified object. The result istrue if and only if the argument is notnull and is aCharacter object that represents the samechar value as this object.

  Overrides:

  equals in class Object

  Parameters:

  obj - the object to compare with.

  Returns:

  true if the objects are the same;false otherwise.

  See Also:

  • Object.hashCode()
  • HashMap

• toString

  public String toString()

  Returns aString object representing thisCharacter's value. The result is a string of length 1 whose sole component is the primitivechar value represented by thisCharacter object.

  Overrides:

  toString in class Object

  Returns:

  a string representation of this object.

• toString

  public static String toString(char c)

  Returns aString object representing the specifiedchar. The result is a string of length 1 consisting solely of the specifiedchar.

  API Note:

  This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thetoString(int) method.

  Parameters:

  c - thechar to be converted

  Returns:

  the string representation of the specifiedchar

  Since:

  1.4

• toString

  public static String toString(int codePoint)

  Returns aString object representing the specified character (Unicode code point). The result is a string of length 1 or 2, consisting solely of the specifiedcodePoint.

  Parameters:

  codePoint - thecodePoint to be converted

  Returns:

  the string representation of the specifiedcodePoint

  Throws:

  IllegalArgumentException - if the specifiedcodePoint is not avalid Unicode code point.

  Since:

  11

• isValidCodePoint

  public static boolean isValidCodePoint(int codePoint)

  Determines whether the specified code point is a valid Unicode code point value.

  Parameters:

  codePoint - the Unicode code point to be tested

  Returns:

  true if the specified code point value is betweenMIN_CODE_POINT andMAX_CODE_POINT inclusive;false otherwise.

  Since:

  1.5

• isBmpCodePoint

  public static boolean isBmpCodePoint(int codePoint)

  Determines whether the specified character (Unicode code point) is in theBasic Multilingual Plane (BMP). Such code points can be represented using a singlechar.

  Parameters:

  codePoint - the character (Unicode code point) to be tested

  Returns:

  true if the specified code point is betweenMIN_VALUE andMAX_VALUE inclusive;false otherwise.

  Since:

  1.7

• isSupplementaryCodePoint

  public static boolean isSupplementaryCodePoint(int codePoint)

  Determines whether the specified character (Unicode code point) is in thesupplementary character range.

  Parameters:

  codePoint - the character (Unicode code point) to be tested

  Returns:

  true if the specified code point is betweenMIN_SUPPLEMENTARY_CODE_POINT andMAX_CODE_POINT inclusive;false otherwise.

  Since:

  1.5

• isHighSurrogate

  public static boolean isHighSurrogate(char ch)

  Determines if the givenchar value is a Unicode high-surrogate code unit (also known asleading-surrogate code unit).

  Such values do not represent characters by themselves, but are used in the representation ofsupplementary characters in the UTF-16 encoding.

  Parameters:

  ch - thechar value to be tested.

  Returns:

  true if thechar value is betweenMIN_HIGH_SURROGATE andMAX_HIGH_SURROGATE inclusive;false otherwise.

  Since:

  1.5

  See Also:

  • isLowSurrogate(char)
  • Character.UnicodeBlock.of(int)

• isLowSurrogate

  public static boolean isLowSurrogate(char ch)

  Determines if the givenchar value is a Unicode low-surrogate code unit (also known astrailing-surrogate code unit).

  Such values do not represent characters by themselves, but are used in the representation ofsupplementary characters in the UTF-16 encoding.

  Parameters:

  ch - thechar value to be tested.

  Returns:

  true if thechar value is betweenMIN_LOW_SURROGATE andMAX_LOW_SURROGATE inclusive;false otherwise.

  Since:

  1.5

  See Also:

  • isHighSurrogate(char)

• isSurrogate

  public static boolean isSurrogate(char ch)

  Determines if the givenchar value is a Unicodesurrogate code unit.

  Such values do not represent characters by themselves, but are used in the representation ofsupplementary characters in the UTF-16 encoding.

  A char value is a surrogate code unit if and only if it is either alow-surrogate code unit or ahigh-surrogate code unit.

  Parameters:

  ch - thechar value to be tested.

  Returns:

  true if thechar value is betweenMIN_SURROGATE andMAX_SURROGATE inclusive;false otherwise.

  Since:

  1.7

• isSurrogatePair

  public static boolean isSurrogatePair(char high, char low)

  Determines whether the specified pair ofchar values is a valid Unicode surrogate pair.

  This method is equivalent to the expression:

   isHighSurrogate(high) && isLowSurrogate(low)

  Parameters:

  high - the high-surrogate code value to be tested

  low - the low-surrogate code value to be tested

  Returns:

  true if the specified high and low-surrogate code values represent a valid surrogate pair;false otherwise.

  Since:

  1.5

• charCount

  public static int charCount(int codePoint)

  Determines the number ofchar values needed to represent the specified character (Unicode code point). If the specified character is equal to or greater than 0x10000, then the method returns 2. Otherwise, the method returns 1.

  This method doesn't validate the specified character to be a valid Unicode code point. The caller must validate the character value usingisValidCodePoint if necessary.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  2 if the character is a valid supplementary character; 1 otherwise.

  Since:

  1.5

  See Also:

  • isSupplementaryCodePoint(int)

• toCodePoint

  public static int toCodePoint(char high, char low)

  Converts the specified surrogate pair to its supplementary code point value. This method does not validate the specified surrogate pair. The caller must validate it usingisSurrogatePair if necessary.

  Parameters:

  high - the high-surrogate code unit

  low - the low-surrogate code unit

  Returns:

  the supplementary code point composed from the specified surrogate pair.

  Since:

  1.5

• codePointAt

  public static int codePointAt(CharSequence seq, int index)

  Returns the code point at the given index of theCharSequence. If thechar value at the given index in theCharSequence is in the high-surrogate range, the following index is less than the length of theCharSequence, and thechar value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, thechar value at the given index is returned.

  Parameters:

  seq - a sequence ofchar values (Unicode code units)

  index - the index to thechar values (Unicode code units) inseq to be converted

  Returns:

  the Unicode code point at the given index

  Throws:

  NullPointerException - ifseq is null.

  IndexOutOfBoundsException - if the valueindex is negative or not less thanseq.length().

  Since:

  1.5

• codePointAt

  public static int codePointAt(char[] a, int index)

  Returns the code point at the given index of thechar array. If thechar value at the given index in thechar array is in the high-surrogate range, the following index is less than the length of thechar array, and thechar value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, thechar value at the given index is returned.

  Parameters:

  a - thechar array

  index - the index to thechar values (Unicode code units) in thechar array to be converted

  Returns:

  the Unicode code point at the given index

  Throws:

  NullPointerException - ifa is null.

  IndexOutOfBoundsException - if the valueindex is negative or not less than the length of thechar array.

  Since:

  1.5

• codePointAt

  public static int codePointAt(char[] a, int index, int limit)

  Returns the code point at the given index of thechar array, where only array elements withindex less thanlimit can be used. If thechar value at the given index in thechar array is in the high-surrogate range, the following index is less than thelimit, and thechar value at the following index is in the low-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, thechar value at the given index is returned.

  Parameters:

  a - thechar array

  index - the index to thechar values (Unicode code units) in thechar array to be converted

  limit - the index after the last array element that can be used in thechar array

  Returns:

  the Unicode code point at the given index

  Throws:

  NullPointerException - ifa is null.

  IndexOutOfBoundsException - if theindex argument is negative or not less than thelimit argument, or if thelimit argument is negative or greater than the length of thechar array.

  Since:

  1.5

• codePointBefore

  public static int codePointBefore(CharSequence seq, int index)

  Returns the code point preceding the given index of theCharSequence. If thechar value at(index - 1) in theCharSequence is in the low-surrogate range,(index - 2) is not negative, and thechar value at(index - 2) in theCharSequence is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, thechar value at(index - 1) is returned.

  Parameters:

  seq - theCharSequence instance

  index - the index following the code point that should be returned

  Returns:

  the Unicode code point value before the given index.

  Throws:

  NullPointerException - ifseq is null.

  IndexOutOfBoundsException - if theindex argument is less than 1 or greater thanseq.length().

  Since:

  1.5

• codePointBefore

  public static int codePointBefore(char[] a, int index)

  Returns the code point preceding the given index of thechar array. If thechar value at(index - 1) in thechar array is in the low-surrogate range,(index - 2) is not negative, and thechar value at(index - 2) in thechar array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, thechar value at(index - 1) is returned.

  Parameters:

  a - thechar array

  index - the index following the code point that should be returned

  Returns:

  the Unicode code point value before the given index.

  Throws:

  NullPointerException - ifa is null.

  IndexOutOfBoundsException - if theindex argument is less than 1 or greater than the length of thechar array

  Since:

  1.5

• codePointBefore

  public static int codePointBefore(char[] a, int index, int start)

  Returns the code point preceding the given index of thechar array, where only array elements withindex greater than or equal tostart can be used. If thechar value at(index - 1) in thechar array is in the low-surrogate range,(index - 2) is not less thanstart, and thechar value at(index - 2) in thechar array is in the high-surrogate range, then the supplementary code point corresponding to this surrogate pair is returned. Otherwise, thechar value at(index - 1) is returned.

  Parameters:

  a - thechar array

  index - the index following the code point that should be returned

  start - the index of the first array element in thechar array

  Returns:

  the Unicode code point value before the given index.

  Throws:

  NullPointerException - ifa is null.

  IndexOutOfBoundsException - if theindex argument is not greater than thestart argument or is greater than the length of thechar array, or if thestart argument is negative or not less than the length of thechar array.

  Since:

  1.5

• highSurrogate

  public static char highSurrogate(int codePoint)

  Returns the leading surrogate (a high surrogate code unit) of the surrogate pair representing the specified supplementary character (Unicode code point) in the UTF-16 encoding. If the specified character is not asupplementary character, an unspecifiedchar is returned.

  IfisSupplementaryCodePoint(x) istrue, thenisHighSurrogate(highSurrogate(x)) andtoCodePoint(highSurrogate(x),lowSurrogate(x)) == x are also alwaystrue.

  Parameters:

  codePoint - a supplementary character (Unicode code point)

  Returns:

  the leading surrogate code unit used to represent the character in the UTF-16 encoding

  Since:

  1.7

• lowSurrogate

  public static char lowSurrogate(int codePoint)

  Returns the trailing surrogate (a low surrogate code unit) of the surrogate pair representing the specified supplementary character (Unicode code point) in the UTF-16 encoding. If the specified character is not asupplementary character, an unspecifiedchar is returned.

  IfisSupplementaryCodePoint(x) istrue, thenisLowSurrogate(lowSurrogate(x)) andtoCodePoint(highSurrogate(x), lowSurrogate(x)) == x are also alwaystrue.

  Parameters:

  codePoint - a supplementary character (Unicode code point)

  Returns:

  the trailing surrogate code unit used to represent the character in the UTF-16 encoding

  Since:

  1.7

• toChars

  public static int toChars(int codePoint, char[] dst, int dstIndex)

  Converts the specified character (Unicode code point) to its UTF-16 representation. If the specified code point is a BMP (Basic Multilingual Plane or Plane 0) value, the same value is stored indst[dstIndex], and 1 is returned. If the specified code point is a supplementary character, its surrogate values are stored indst[dstIndex] (high-surrogate) anddst[dstIndex+1] (low-surrogate), and 2 is returned.

  Parameters:

  codePoint - the character (Unicode code point) to be converted.

  dst - an array ofchar in which thecodePoint's UTF-16 value is stored.

  dstIndex - the start index into thedst array where the converted value is stored.

  Returns:

  1 if the code point is a BMP code point, 2 if the code point is a supplementary code point.

  Throws:

  IllegalArgumentException - if the specifiedcodePoint is not a valid Unicode code point.

  NullPointerException - if the specifieddst is null.

  IndexOutOfBoundsException - ifdstIndex is negative or not less thandst.length, or ifdst atdstIndex doesn't have enough array element(s) to store the resultingchar value(s). (IfdstIndex is equal todst.length-1 and the specifiedcodePoint is a supplementary character, the high-surrogate value is not stored indst[dstIndex].)

  Since:

  1.5

• toChars

  public static char[] toChars(int codePoint)

  Converts the specified character (Unicode code point) to its UTF-16 representation stored in achar array. If the specified code point is a BMP (Basic Multilingual Plane or Plane 0) value, the resultingchar array has the same value ascodePoint. If the specified code point is a supplementary code point, the resultingchar array has the corresponding surrogate pair.

  Parameters:

  codePoint - a Unicode code point

  Returns:

  achar array havingcodePoint's UTF-16 representation.

  Throws:

  IllegalArgumentException - if the specifiedcodePoint is not a valid Unicode code point.

  Since:

  1.5

• codePointCount

  public static int codePointCount(CharSequence seq, int beginIndex, int endIndex)

  Returns the number of Unicode code points in the text range of the specified char sequence. The text range begins at the specifiedbeginIndex and extends to thechar at indexendIndex - 1. Thus the length (inchars) of the text range isendIndex-beginIndex. Unpaired surrogates within the text range count as one code point each.

  Parameters:

  seq - the char sequence

  beginIndex - the index to the firstchar of the text range.

  endIndex - the index after the lastchar of the text range.

  Returns:

  the number of Unicode code points in the specified text range

  Throws:

  NullPointerException - ifseq is null.

  IndexOutOfBoundsException - if thebeginIndex is negative, orendIndex is larger than the length of the given sequence, orbeginIndex is larger thanendIndex.

  Since:

  1.5

• codePointCount

  public static int codePointCount(char[] a, int offset, int count)

  Returns the number of Unicode code points in a subarray of thechar array argument. Theoffset argument is the index of the firstchar of the subarray and thecount argument specifies the length of the subarray inchars. Unpaired surrogates within the subarray count as one code point each.

  Parameters:

  a - thechar array

  offset - the index of the firstchar in the givenchar array

  count - the length of the subarray inchars

  Returns:

  the number of Unicode code points in the specified subarray

  Throws:

  NullPointerException - ifa is null.

  IndexOutOfBoundsException - ifoffset orcount is negative, or ifoffset + count is larger than the length of the given array.

  Since:

  1.5

• offsetByCodePoints

  public static int offsetByCodePoints(CharSequence seq, int index, int codePointOffset)

  Returns the index within the given char sequence that is offset from the givenindex bycodePointOffset code points. Unpaired surrogates within the text range given byindex andcodePointOffset count as one code point each.

  Parameters:

  seq - the char sequence

  index - the index to be offset

  codePointOffset - the offset in code points

  Returns:

  the index within the char sequence

  Throws:

  NullPointerException - ifseq is null.

  IndexOutOfBoundsException - ifindex is negative or larger than the length of the char sequence, or ifcodePointOffset is positive and the subsequence starting withindex has fewer thancodePointOffset code points, or ifcodePointOffset is negative and the subsequence beforeindex has fewer than the absolute value ofcodePointOffset code points.

  Since:

  1.5

• offsetByCodePoints

  public static int offsetByCodePoints(char[] a, int start, int count, int index, int codePointOffset)

  Returns the index within the givenchar subarray that is offset from the givenindex bycodePointOffset code points. Thestart andcount arguments specify a subarray of thechar array. Unpaired surrogates within the text range given byindex andcodePointOffset count as one code point each.

  Parameters:

  a - thechar array

  start - the index of the firstchar of the subarray

  count - the length of the subarray inchars

  index - the index to be offset

  codePointOffset - the offset in code points

  Returns:

  the index within the subarray

  Throws:

  NullPointerException - ifa is null.

  IndexOutOfBoundsException - ifstart orcount is negative, or ifstart + count is larger than the length of the given array, or ifindex is less thanstart or larger thenstart + count, or ifcodePointOffset is positive and the text range starting withindex and ending withstart + count - 1 has fewer thancodePointOffset code points, or ifcodePointOffset is negative and the text range starting withstart and ending withindex - 1 has fewer than the absolute value ofcodePointOffset code points.

  Since:

  1.5

• isLowerCase

  public static boolean isLowerCase(char ch)

  Determines if the specified character is a lowercase character.

  A character is lowercase if its general category type, provided byCharacter.getType(ch), isLOWERCASE_LETTER, or it has contributory property Other_Lowercase as defined by the Unicode Standard.

  The following are examples of lowercase characters:

   a b c d e f g h i j k l m n o p q r s t u v w x y z '\u00DF' '\u00E0' '\u00E1' '\u00E2' '\u00E3' '\u00E4' '\u00E5' '\u00E6' '\u00E7' '\u00E8' '\u00E9' '\u00EA' '\u00EB' '\u00EC' '\u00ED' '\u00EE' '\u00EF' '\u00F0' '\u00F1' '\u00F2' '\u00F3' '\u00F4' '\u00F5' '\u00F6' '\u00F8' '\u00F9' '\u00FA' '\u00FB' '\u00FC' '\u00FD' '\u00FE' '\u00FF'

  Many other Unicode characters are lowercase too.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisLowerCase(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is lowercase;false otherwise.

  See Also:

  • isLowerCase(char)
  • isTitleCase(char)
  • toLowerCase(char)
  • getType(char)

• isLowerCase

  public static boolean isLowerCase(int codePoint)

  Determines if the specified character (Unicode code point) is a lowercase character.

  A character is lowercase if its general category type, provided bygetType(codePoint), isLOWERCASE_LETTER, or it has contributory property Other_Lowercase as defined by the Unicode Standard.

  The following are examples of lowercase characters:

   a b c d e f g h i j k l m n o p q r s t u v w x y z '\u00DF' '\u00E0' '\u00E1' '\u00E2' '\u00E3' '\u00E4' '\u00E5' '\u00E6' '\u00E7' '\u00E8' '\u00E9' '\u00EA' '\u00EB' '\u00EC' '\u00ED' '\u00EE' '\u00EF' '\u00F0' '\u00F1' '\u00F2' '\u00F3' '\u00F4' '\u00F5' '\u00F6' '\u00F8' '\u00F9' '\u00FA' '\u00FB' '\u00FC' '\u00FD' '\u00FE' '\u00FF'

  Many other Unicode characters are lowercase too.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is lowercase;false otherwise.

  Since:

  1.5

  See Also:

  • isLowerCase(int)
  • isTitleCase(int)
  • toLowerCase(int)
  • getType(int)

• isUpperCase

  public static boolean isUpperCase(char ch)

  Determines if the specified character is an uppercase character.

  A character is uppercase if its general category type, provided byCharacter.getType(ch), isUPPERCASE_LETTER. or it has contributory property Other_Uppercase as defined by the Unicode Standard.

  The following are examples of uppercase characters:

   A B C D E F G H I J K L M N O P Q R S T U V W X Y Z '\u00C0' '\u00C1' '\u00C2' '\u00C3' '\u00C4' '\u00C5' '\u00C6' '\u00C7' '\u00C8' '\u00C9' '\u00CA' '\u00CB' '\u00CC' '\u00CD' '\u00CE' '\u00CF' '\u00D0' '\u00D1' '\u00D2' '\u00D3' '\u00D4' '\u00D5' '\u00D6' '\u00D8' '\u00D9' '\u00DA' '\u00DB' '\u00DC' '\u00DD' '\u00DE'

  Many other Unicode characters are uppercase too.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisUpperCase(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is uppercase;false otherwise.

  Since:

  1.0

  See Also:

  • isLowerCase(char)
  • isTitleCase(char)
  • toUpperCase(char)
  • getType(char)

• isUpperCase

  public static boolean isUpperCase(int codePoint)

  Determines if the specified character (Unicode code point) is an uppercase character.

  A character is uppercase if its general category type, provided bygetType(codePoint), isUPPERCASE_LETTER, or it has contributory property Other_Uppercase as defined by the Unicode Standard.

  The following are examples of uppercase characters:

   A B C D E F G H I J K L M N O P Q R S T U V W X Y Z '\u00C0' '\u00C1' '\u00C2' '\u00C3' '\u00C4' '\u00C5' '\u00C6' '\u00C7' '\u00C8' '\u00C9' '\u00CA' '\u00CB' '\u00CC' '\u00CD' '\u00CE' '\u00CF' '\u00D0' '\u00D1' '\u00D2' '\u00D3' '\u00D4' '\u00D5' '\u00D6' '\u00D8' '\u00D9' '\u00DA' '\u00DB' '\u00DC' '\u00DD' '\u00DE'

  Many other Unicode characters are uppercase too.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is uppercase;false otherwise.

  Since:

  1.5

  See Also:

  • isLowerCase(int)
  • isTitleCase(int)
  • toUpperCase(int)
  • getType(int)

• isTitleCase

  public static boolean isTitleCase(char ch)

  Determines if the specified character is a titlecase character.

  A character is a titlecase character if its general category type, provided byCharacter.getType(ch), isTITLECASE_LETTER.

  Some characters look like pairs of Latin letters. For example, there is an uppercase letter that looks like "LJ" and has a corresponding lowercase letter that looks like "lj". A third form, which looks like "Lj", is the appropriate form to use when rendering a word in lowercase with initial capitals, as for a book title.

  These are some of the Unicode characters for which this method returnstrue:

  • LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
  • LATIN CAPITAL LETTER L WITH SMALL LETTER J
  • LATIN CAPITAL LETTER N WITH SMALL LETTER J
  • LATIN CAPITAL LETTER D WITH SMALL LETTER Z

  Many other Unicode characters are titlecase too.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisTitleCase(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is titlecase;false otherwise.

  Since:

  1.0.2

  See Also:

  • isLowerCase(char)
  • isUpperCase(char)
  • toTitleCase(char)
  • getType(char)

• isTitleCase

  public static boolean isTitleCase(int codePoint)

  Determines if the specified character (Unicode code point) is a titlecase character.

  A character is a titlecase character if its general category type, provided bygetType(codePoint), isTITLECASE_LETTER.

  Some characters look like pairs of Latin letters. For example, there is an uppercase letter that looks like "LJ" and has a corresponding lowercase letter that looks like "lj". A third form, which looks like "Lj", is the appropriate form to use when rendering a word in lowercase with initial capitals, as for a book title.

  These are some of the Unicode characters for which this method returnstrue:

  • LATIN CAPITAL LETTER D WITH SMALL LETTER Z WITH CARON
  • LATIN CAPITAL LETTER L WITH SMALL LETTER J
  • LATIN CAPITAL LETTER N WITH SMALL LETTER J
  • LATIN CAPITAL LETTER D WITH SMALL LETTER Z

  Many other Unicode characters are titlecase too.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is titlecase;false otherwise.

  Since:

  1.5

  See Also:

  • isLowerCase(int)
  • isUpperCase(int)
  • toTitleCase(int)
  • getType(int)

• isDigit

  public static boolean isDigit(char ch)

  Determines if the specified character is a digit.

  A character is a digit if its general category type, provided byCharacter.getType(ch), isDECIMAL_DIGIT_NUMBER.

  Some Unicode character ranges that contain digits:

  • '\u0030' through'\u0039', ISO-LATIN-1 digits ('0' through'9')
  • '\u0660' through'\u0669', Arabic-Indic digits
  • '\u06F0' through'\u06F9', Extended Arabic-Indic digits
  • '\u0966' through'\u096F', Devanagari digits
  • '\uFF10' through'\uFF19', Fullwidth digits

  Many other character ranges contain digits as well.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisDigit(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is a digit;false otherwise.

  See Also:

  • digit(char, int)
  • forDigit(int, int)
  • getType(char)

• isDigit

  public static boolean isDigit(int codePoint)

  Determines if the specified character (Unicode code point) is a digit.

  A character is a digit if its general category type, provided bygetType(codePoint), isDECIMAL_DIGIT_NUMBER.

  Some Unicode character ranges that contain digits:

  • '\u0030' through'\u0039', ISO-LATIN-1 digits ('0' through'9')
  • '\u0660' through'\u0669', Arabic-Indic digits
  • '\u06F0' through'\u06F9', Extended Arabic-Indic digits
  • '\u0966' through'\u096F', Devanagari digits
  • '\uFF10' through'\uFF19', Fullwidth digits

  Many other character ranges contain digits as well.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a digit;false otherwise.

  Since:

  1.5

  See Also:

  • forDigit(int, int)
  • getType(int)

• isDefined

  public static boolean isDefined(char ch)

  Determines if a character is defined in Unicode.

  A character is defined if at least one of the following is true:

  • It has an entry in the UnicodeData file.
  • It has a value in a range defined by the UnicodeData file.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisDefined(int) method.

  Parameters:

  ch - the character to be tested

  Returns:

  true if the character has a defined meaning in Unicode;false otherwise.

  Since:

  1.0.2

  See Also:

  • isDigit(char)
  • isLetter(char)
  • isLetterOrDigit(char)
  • isLowerCase(char)
  • isTitleCase(char)
  • isUpperCase(char)

• isDefined

  public static boolean isDefined(int codePoint)

  Determines if a character (Unicode code point) is defined in Unicode.

  A character is defined if at least one of the following is true:

  • It has an entry in the UnicodeData file.
  • It has a value in a range defined by the UnicodeData file.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character has a defined meaning in Unicode;false otherwise.

  Since:

  1.5

  See Also:

  • isDigit(int)
  • isLetter(int)
  • isLetterOrDigit(int)
  • isLowerCase(int)
  • isTitleCase(int)
  • isUpperCase(int)

• isLetter

  public static boolean isLetter(char ch)

  Determines if the specified character is a letter.

  A character is considered to be a letter if its general category type, provided byCharacter.getType(ch), is any of the following:

  • UPPERCASE_LETTER
  • LOWERCASE_LETTER
  • TITLECASE_LETTER
  • MODIFIER_LETTER
  • OTHER_LETTER

  Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisLetter(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is a letter;false otherwise.

  See Also:

  • isDigit(char)
  • isJavaIdentifierStart(char)
  • isJavaLetter(char)
  • isJavaLetterOrDigit(char)
  • isLetterOrDigit(char)
  • isLowerCase(char)
  • isTitleCase(char)
  • isUnicodeIdentifierStart(char)
  • isUpperCase(char)

• isLetter

  public static boolean isLetter(int codePoint)

  Determines if the specified character (Unicode code point) is a letter.

  A character is considered to be a letter if its general category type, provided bygetType(codePoint), is any of the following:

  • UPPERCASE_LETTER
  • LOWERCASE_LETTER
  • TITLECASE_LETTER
  • MODIFIER_LETTER
  • OTHER_LETTER

  Not all letters have case. Many characters are letters but are neither uppercase nor lowercase nor titlecase.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a letter;false otherwise.

  Since:

  1.5

  See Also:

  • isDigit(int)
  • isJavaIdentifierStart(int)
  • isLetterOrDigit(int)
  • isLowerCase(int)
  • isTitleCase(int)
  • isUnicodeIdentifierStart(int)
  • isUpperCase(int)

• isLetterOrDigit

  public static boolean isLetterOrDigit(char ch)

  Determines if the specified character is a letter or digit.

  A character is considered to be a letter or digit if eitherCharacter.isLetter(char ch) orCharacter.isDigit(char ch) returnstrue for the character.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisLetterOrDigit(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is a letter or digit;false otherwise.

  Since:

  1.0.2

  See Also:

  • isDigit(char)
  • isJavaIdentifierPart(char)
  • isJavaLetter(char)
  • isJavaLetterOrDigit(char)
  • isLetter(char)
  • isUnicodeIdentifierPart(char)

• isLetterOrDigit

  public static boolean isLetterOrDigit(int codePoint)

  Determines if the specified character (Unicode code point) is a letter or digit.

  A character is considered to be a letter or digit if eitherisLetter(codePoint) orisDigit(codePoint) returnstrue for the character.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a letter or digit;false otherwise.

  Since:

  1.5

  See Also:

  • isDigit(int)
  • isJavaIdentifierPart(int)
  • isLetter(int)
  • isUnicodeIdentifierPart(int)

• isJavaLetter

  @Deprecated(since="1.1")public static boolean isJavaLetter(char ch)

  Deprecated.

  Replaced by isJavaIdentifierStart(char).

  Determines if the specified character is permissible as the first character in a Java identifier.

  A character may start a Java identifier if and only if one of the following conditions is true:

  • isLetter(ch) returnstrue
  • getType(ch) returnsLETTER_NUMBER
  • ch is a currency symbol (such as'$')
  • ch is a connecting punctuation character (such as'_').

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character may start a Java identifier;false otherwise.

  Since:

  1.0.2

  See Also:

  • isJavaLetterOrDigit(char)
  • isJavaIdentifierStart(char)
  • isJavaIdentifierPart(char)
  • isLetter(char)
  • isLetterOrDigit(char)
  • isUnicodeIdentifierStart(char)

• isJavaLetterOrDigit

  @Deprecated(since="1.1")public static boolean isJavaLetterOrDigit(char ch)

  Deprecated.

  Replaced by isJavaIdentifierPart(char).

  Determines if the specified character may be part of a Java identifier as other than the first character.

  A character may be part of a Java identifier if and only if one of the following conditions is true:

  • it is a letter
  • it is a currency symbol (such as'$')
  • it is a connecting punctuation character (such as'_')
  • it is a digit
  • it is a numeric letter (such as a Roman numeral character)
  • it is a combining mark
  • it is a non-spacing mark
  • isIdentifierIgnorable returnstrue for the character.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character may be part of a Java identifier;false otherwise.

  Since:

  1.0.2

  See Also:

  • isJavaLetter(char)
  • isJavaIdentifierStart(char)
  • isJavaIdentifierPart(char)
  • isLetter(char)
  • isLetterOrDigit(char)
  • isUnicodeIdentifierPart(char)
  • isIdentifierIgnorable(char)

• isAlphabetic

  public static boolean isAlphabetic(int codePoint)

  Determines if the specified character (Unicode code point) is alphabetic.

  A character is considered to be alphabetic if its general category type, provided bygetType(codePoint), is any of the following:

  • UPPERCASE_LETTER
  • LOWERCASE_LETTER
  • TITLECASE_LETTER
  • MODIFIER_LETTER
  • OTHER_LETTER
  • LETTER_NUMBER

  or it has contributory property Other_Alphabetic as defined by the Unicode Standard.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a Unicode alphabet character,false otherwise.

  Since:

  1.7

• isIdeographic

  public static boolean isIdeographic(int codePoint)

  Determines if the specified character (Unicode code point) is a CJKV (Chinese, Japanese, Korean and Vietnamese) ideograph, as defined by the Unicode Standard.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a Unicode ideograph character,false otherwise.

  Since:

  1.7

• isJavaIdentifierStart

  public static boolean isJavaIdentifierStart(char ch)

  Determines if the specified character is permissible as the first character in a Java identifier.

  A character may start a Java identifier if and only if one of the following conditions is true:

  • isLetter(ch) returnstrue
  • getType(ch) returnsLETTER_NUMBER
  • ch is a currency symbol (such as'$')
  • ch is a connecting punctuation character (such as'_').

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisJavaIdentifierStart(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character may start a Java identifier;false otherwise.

  Since:

  1.1

  See Also:

  • isJavaIdentifierPart(char)
  • isLetter(char)
  • isUnicodeIdentifierStart(char)
  • SourceVersion.isIdentifier(CharSequence)

• isJavaIdentifierStart

  public static boolean isJavaIdentifierStart(int codePoint)

  Determines if the character (Unicode code point) is permissible as the first character in a Java identifier.

  A character may start a Java identifier if and only if one of the following conditions is true:

  • isLetter(codePoint) returnstrue
  • getType(codePoint) returnsLETTER_NUMBER
  • the referenced character is a currency symbol (such as'$')
  • the referenced character is a connecting punctuation character (such as'_').

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character may start a Java identifier;false otherwise.

  Since:

  1.5

  See Also:

  • isJavaIdentifierPart(int)
  • isLetter(int)
  • isUnicodeIdentifierStart(int)
  • SourceVersion.isIdentifier(CharSequence)

• isJavaIdentifierPart

  public static boolean isJavaIdentifierPart(char ch)

  Determines if the specified character may be part of a Java identifier as other than the first character.

  A character may be part of a Java identifier if any of the following conditions are true:

  • it is a letter
  • it is a currency symbol (such as'$')
  • it is a connecting punctuation character (such as'_')
  • it is a digit
  • it is a numeric letter (such as a Roman numeral character)
  • it is a combining mark
  • it is a non-spacing mark
  • isIdentifierIgnorable returnstrue for the character

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisJavaIdentifierPart(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character may be part of a Java identifier;false otherwise.

  Since:

  1.1

  See Also:

  • isIdentifierIgnorable(char)
  • isJavaIdentifierStart(char)
  • isLetterOrDigit(char)
  • isUnicodeIdentifierPart(char)
  • SourceVersion.isIdentifier(CharSequence)

• isJavaIdentifierPart

  public static boolean isJavaIdentifierPart(int codePoint)

  Determines if the character (Unicode code point) may be part of a Java identifier as other than the first character.

  A character may be part of a Java identifier if any of the following conditions are true:

  • it is a letter
  • it is a currency symbol (such as'$')
  • it is a connecting punctuation character (such as'_')
  • it is a digit
  • it is a numeric letter (such as a Roman numeral character)
  • it is a combining mark
  • it is a non-spacing mark
  • isIdentifierIgnorable(codePoint) returnstrue for the code point

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character may be part of a Java identifier;false otherwise.

  Since:

  1.5

  See Also:

  • isIdentifierIgnorable(int)
  • isJavaIdentifierStart(int)
  • isLetterOrDigit(int)
  • isUnicodeIdentifierPart(int)
  • SourceVersion.isIdentifier(CharSequence)

• isUnicodeIdentifierStart

  public static boolean isUnicodeIdentifierStart(char ch)

  Determines if the specified character is permissible as the first character in a Unicode identifier.

  A character may start a Unicode identifier if and only if one of the following conditions is true:

  • isLetter(ch) returnstrue
  • getType(ch) returnsLETTER_NUMBER.
  • it is anOther_ID_Start character.

  This method conforms to UAX31-R1: Default Identifiers requirement of the Unicode Standard, with the following profile of UAX31:

   Start := ID_Start + 'VERTICAL TILDE' (U+2E2F)

  'VERTICAL TILDE' is added toStart for backward compatibility.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisUnicodeIdentifierStart(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character may start a Unicode identifier;false otherwise.

  Since:

  1.1

  External Specifications

  • Unicode Character Database
  • Unicode Identifier and Pattern Syntax

  See Also:

  • isJavaIdentifierStart(char)
  • isLetter(char)
  • isUnicodeIdentifierPart(char)

• isUnicodeIdentifierStart

  public static boolean isUnicodeIdentifierStart(int codePoint)

  Determines if the specified character (Unicode code point) is permissible as the first character in a Unicode identifier.

  A character may start a Unicode identifier if and only if one of the following conditions is true:

  • isLetter(codePoint) returnstrue
  • getType(codePoint) returnsLETTER_NUMBER.
  • it is anOther_ID_Start character.

  This method conforms to UAX31-R1: Default Identifiers requirement of the Unicode Standard, with the following profile of UAX31:

   Start := ID_Start + 'VERTICAL TILDE' (U+2E2F)

  'VERTICAL TILDE' is added toStart for backward compatibility.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character may start a Unicode identifier;false otherwise.

  Since:

  1.5

  External Specifications

  • Unicode Character Database
  • Unicode Identifier and Pattern Syntax

  See Also:

  • isJavaIdentifierStart(int)
  • isLetter(int)
  • isUnicodeIdentifierPart(int)

• isUnicodeIdentifierPart

  public static boolean isUnicodeIdentifierPart(char ch)

  Determines if the specified character may be part of a Unicode identifier as other than the first character.

  A character may be part of a Unicode identifier if and only if one of the following statements is true:

  • it is a letter
  • it is a connecting punctuation character (such as'_')
  • it is a digit
  • it is a numeric letter (such as a Roman numeral character)
  • it is a combining mark
  • it is a non-spacing mark
  • isIdentifierIgnorable returnstrue for this character.
  • it is anOther_ID_Start character.
  • it is anOther_ID_Continue character.

  This method conforms to UAX31-R1: Default Identifiers requirement of the Unicode Standard, with the following profile of UAX31:

   Continue := Start + ID_Continue + ignorable Medial := empty ignorable := isIdentifierIgnorable(char) returns true for the character

  ignorable is added toContinue for backward compatibility.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisUnicodeIdentifierPart(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character may be part of a Unicode identifier;false otherwise.

  Since:

  1.1

  External Specifications

  • Unicode Character Database
  • Unicode Identifier and Pattern Syntax

  See Also:

  • isIdentifierIgnorable(char)
  • isJavaIdentifierPart(char)
  • isLetterOrDigit(char)
  • isUnicodeIdentifierStart(char)

• isUnicodeIdentifierPart

  public static boolean isUnicodeIdentifierPart(int codePoint)

  Determines if the specified character (Unicode code point) may be part of a Unicode identifier as other than the first character.

  A character may be part of a Unicode identifier if and only if one of the following statements is true:

  • it is a letter
  • it is a connecting punctuation character (such as'_')
  • it is a digit
  • it is a numeric letter (such as a Roman numeral character)
  • it is a combining mark
  • it is a non-spacing mark
  • isIdentifierIgnorable returnstrue for this character.
  • it is anOther_ID_Start character.
  • it is anOther_ID_Continue character.

  This method conforms to UAX31-R1: Default Identifiers requirement of the Unicode Standard, with the following profile of UAX31:

   Continue := Start + ID_Continue + ignorable Medial := empty ignorable := isIdentifierIgnorable(int) returns true for the character

  ignorable is added toContinue for backward compatibility.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character may be part of a Unicode identifier;false otherwise.

  Since:

  1.5

  External Specifications

  • Unicode Character Database
  • Unicode Identifier and Pattern Syntax

  See Also:

  • isIdentifierIgnorable(int)
  • isJavaIdentifierPart(int)
  • isLetterOrDigit(int)
  • isUnicodeIdentifierStart(int)

• isIdentifierIgnorable

  public static boolean isIdentifierIgnorable(char ch)

  Determines if the specified character should be regarded as an ignorable character in a Java identifier or a Unicode identifier.

  The following Unicode characters are ignorable in a Java identifier or a Unicode identifier:

  • ISO control characters that are not whitespace
    • '\u0000' through'\u0008'
    • '\u000E' through'\u001B'
    • '\u007F' through'\u009F'
  • all characters that have theFORMAT general category value

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisIdentifierIgnorable(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is an ignorable control character that may be part of a Java or Unicode identifier;false otherwise.

  Since:

  1.1

  See Also:

  • isJavaIdentifierPart(char)
  • isUnicodeIdentifierPart(char)

• isIdentifierIgnorable

  public static boolean isIdentifierIgnorable(int codePoint)

  Determines if the specified character (Unicode code point) should be regarded as an ignorable character in a Java identifier or a Unicode identifier.

  The following Unicode characters are ignorable in a Java identifier or a Unicode identifier:

  • ISO control characters that are not whitespace
    • '\u0000' through'\u0008'
    • '\u000E' through'\u001B'
    • '\u007F' through'\u009F'
  • all characters that have theFORMAT general category value

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an ignorable control character that may be part of a Java or Unicode identifier;false otherwise.

  Since:

  1.5

  See Also:

  • isJavaIdentifierPart(int)
  • isUnicodeIdentifierPart(int)

• isEmoji

  public static boolean isEmoji(int codePoint)

  Determines if the specified character (Unicode code point) is an Emoji.

  A character is considered to be an Emoji if and only if it has theEmoji property, defined in Unicode Emoji (Technical Standard #51).

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an Emoji;false otherwise.

  Since:

  21

• isEmojiPresentation

  public static boolean isEmojiPresentation(int codePoint)

  Determines if the specified character (Unicode code point) has the Emoji Presentation property by default.

  A character is considered to have the Emoji Presentation property if and only if it has theEmoji_Presentation property, defined in Unicode Emoji (Technical Standard #51).

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character has the Emoji Presentation property;false otherwise.

  Since:

  21

• isEmojiModifier

  public static boolean isEmojiModifier(int codePoint)

  Determines if the specified character (Unicode code point) is an Emoji Modifier.

  A character is considered to be an Emoji Modifier if and only if it has theEmoji_Modifier property, defined in Unicode Emoji (Technical Standard #51).

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an Emoji Modifier;false otherwise.

  Since:

  21

• isEmojiModifierBase

  public static boolean isEmojiModifierBase(int codePoint)

  Determines if the specified character (Unicode code point) is an Emoji Modifier Base.

  A character is considered to be an Emoji Modifier Base if and only if it has theEmoji_Modifier_Base property, defined in Unicode Emoji (Technical Standard #51).

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an Emoji Modifier Base;false otherwise.

  Since:

  21

• isEmojiComponent

  public static boolean isEmojiComponent(int codePoint)

  Determines if the specified character (Unicode code point) is an Emoji Component.

  A character is considered to be an Emoji Component if and only if it has theEmoji_Component property, defined in Unicode Emoji (Technical Standard #51).

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an Emoji Component;false otherwise.

  Since:

  21

• isExtendedPictographic

  public static boolean isExtendedPictographic(int codePoint)

  Determines if the specified character (Unicode code point) is an Extended Pictographic.

  A character is considered to be an Extended Pictographic if and only if it has theExtended_Pictographic property, defined in Unicode Emoji (Technical Standard #51).

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an Extended Pictographic;false otherwise.

  Since:

  21

• toLowerCase

  public static char toLowerCase(char ch)

  Converts the character argument to lowercase using case mapping information from the UnicodeData file.

  Note thatCharacter.isLowerCase(Character.toLowerCase(ch)) does not always returntrue for some ranges of characters, particularly those that are symbols or ideographs.

  In general,String.toLowerCase() should be used to map characters to lowercase.String case mapping methods have several benefits overCharacter case mapping methods.String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas theCharacter case mapping methods cannot.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thetoLowerCase(int) method.

  Parameters:

  ch - the character to be converted.

  Returns:

  the lowercase equivalent of the character, if any; otherwise, the character itself.

  See Also:

  • isLowerCase(char)
  • String.toLowerCase()

• toLowerCase

  public static int toLowerCase(int codePoint)

  Converts the character (Unicode code point) argument to lowercase using case mapping information from the UnicodeData file.

  Note thatCharacter.isLowerCase(Character.toLowerCase(codePoint)) does not always returntrue for some ranges of characters, particularly those that are symbols or ideographs.

  In general,String.toLowerCase() should be used to map characters to lowercase.String case mapping methods have several benefits overCharacter case mapping methods.String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas theCharacter case mapping methods cannot.

  Parameters:

  codePoint - the character (Unicode code point) to be converted.

  Returns:

  the lowercase equivalent of the character (Unicode code point), if any; otherwise, the character itself.

  Since:

  1.5

  See Also:

  • isLowerCase(int)
  • String.toLowerCase()

• toUpperCase

  public static char toUpperCase(char ch)

  Converts the character argument to uppercase using case mapping information from the UnicodeData file.

  Note thatCharacter.isUpperCase(Character.toUpperCase(ch)) does not always returntrue for some ranges of characters, particularly those that are symbols or ideographs.

  In general,String.toUpperCase() should be used to map characters to uppercase.String case mapping methods have several benefits overCharacter case mapping methods.String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas theCharacter case mapping methods cannot.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thetoUpperCase(int) method.

  Parameters:

  ch - the character to be converted.

  Returns:

  the uppercase equivalent of the character, if any; otherwise, the character itself.

  See Also:

  • isUpperCase(char)
  • String.toUpperCase()

• toUpperCase

  public static int toUpperCase(int codePoint)

  Converts the character (Unicode code point) argument to uppercase using case mapping information from the UnicodeData file.

  Note thatCharacter.isUpperCase(Character.toUpperCase(codePoint)) does not always returntrue for some ranges of characters, particularly those that are symbols or ideographs.

  In general,String.toUpperCase() should be used to map characters to uppercase.String case mapping methods have several benefits overCharacter case mapping methods.String case mapping methods can perform locale-sensitive mappings, context-sensitive mappings, and 1:M character mappings, whereas theCharacter case mapping methods cannot.

  Parameters:

  codePoint - the character (Unicode code point) to be converted.

  Returns:

  the uppercase equivalent of the character, if any; otherwise, the character itself.

  Since:

  1.5

  See Also:

  • isUpperCase(int)
  • String.toUpperCase()

• toTitleCase

  public static char toTitleCase(char ch)

  Converts the character argument to titlecase using case mapping information from the UnicodeData file. If a character has no explicit titlecase mapping and is not itself a titlecase char according to UnicodeData, then the uppercase mapping is returned as an equivalent titlecase mapping. If thechar argument is already a titlecasechar, the samechar value will be returned.

  Note thatCharacter.isTitleCase(Character.toTitleCase(ch)) does not always returntrue for some ranges of characters.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thetoTitleCase(int) method.

  Parameters:

  ch - the character to be converted.

  Returns:

  the titlecase equivalent of the character, if any; otherwise, the character itself.

  Since:

  1.0.2

  See Also:

  • isTitleCase(char)
  • toLowerCase(char)
  • toUpperCase(char)

• toTitleCase

  public static int toTitleCase(int codePoint)

  Converts the character (Unicode code point) argument to titlecase using case mapping information from the UnicodeData file. If a character has no explicit titlecase mapping and is not itself a titlecase char according to UnicodeData, then the uppercase mapping is returned as an equivalent titlecase mapping. If the character argument is already a titlecase character, the same character value will be returned.

  Note thatCharacter.isTitleCase(Character.toTitleCase(codePoint)) does not always returntrue for some ranges of characters.

  Parameters:

  codePoint - the character (Unicode code point) to be converted.

  Returns:

  the titlecase equivalent of the character, if any; otherwise, the character itself.

  Since:

  1.5

  See Also:

  • isTitleCase(int)
  • toLowerCase(int)
  • toUpperCase(int)

• digit

  public static int digit(char ch, int radix)

  Returns the numeric value of the characterch in the specified radix.

  If the radix is not in the rangeMIN_RADIX ≤radix ≤MAX_RADIX or if the value ofch is not a valid digit in the specified radix,-1 is returned. A character is a valid digit if at least one of the following is true:

  • The methodisDigit istrue of the character and the Unicode decimal digit value of the character (or its single-character decomposition) is less than the specified radix. In this case the decimal digit value is returned.
  • The character is one of the uppercase Latin letters'A' through'Z' and its code is less thanradix + 'A' - 10. In this case,ch - 'A' + 10 is returned.
  • The character is one of the lowercase Latin letters'a' through'z' and its code is less thanradix + 'a' - 10. In this case,ch - 'a' + 10 is returned.
  • The character is one of the fullwidth uppercase Latin letters A ('\uFF21') through Z ('\uFF3A') and its code is less thanradix + '\uFF21' - 10. In this case,ch - '\uFF21' + 10 is returned.
  • The character is one of the fullwidth lowercase Latin letters a ('\uFF41') through z ('\uFF5A') and its code is less thanradix + '\uFF41' - 10. In this case,ch - '\uFF41' + 10 is returned.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thedigit(int, int) method.

  Parameters:

  ch - the character to be converted.

  radix - the radix.

  Returns:

  the numeric value represented by the character in the specified radix.

  See Also:

  • forDigit(int, int)
  • isDigit(char)

• digit

  public static int digit(int codePoint, int radix)

  Returns the numeric value of the specified character (Unicode code point) in the specified radix.

  If the radix is not in the rangeMIN_RADIX ≤radix ≤MAX_RADIX or if the character is not a valid digit in the specified radix,-1 is returned. A character is a valid digit if at least one of the following is true:

  • The methodisDigit(codePoint) istrue of the character and the Unicode decimal digit value of the character (or its single-character decomposition) is less than the specified radix. In this case the decimal digit value is returned.
  • The character is one of the uppercase Latin letters'A' through'Z' and its code is less thanradix + 'A' - 10. In this case,codePoint - 'A' + 10 is returned.
  • The character is one of the lowercase Latin letters'a' through'z' and its code is less thanradix + 'a' - 10. In this case,codePoint - 'a' + 10 is returned.
  • The character is one of the fullwidth uppercase Latin letters A ('\uFF21') through Z ('\uFF3A') and its code is less thanradix + '\uFF21' - 10. In this case,codePoint - '\uFF21' + 10 is returned.
  • The character is one of the fullwidth lowercase Latin letters a ('\uFF41') through z ('\uFF5A') and its code is less thanradix + '\uFF41'- 10. In this case,codePoint - '\uFF41' + 10 is returned.

  Parameters:

  codePoint - the character (Unicode code point) to be converted.

  radix - the radix.

  Returns:

  the numeric value represented by the character in the specified radix.

  Since:

  1.5

  See Also:

  • forDigit(int, int)
  • isDigit(int)

• getNumericValue

  public static int getNumericValue(char ch)

  Returns theint value that the specified Unicode character represents. For example, the character'\u216C' (the roman numeral fifty) will return an int with a value of 50.

  The letters A-Z in their uppercase ('\u0041' through'\u005A'), lowercase ('\u0061' through'\u007A'), and full width variant ('\uFF21' through'\uFF3A' and'\uFF41' through'\uFF5A') forms have numeric values from 10 through 35. This is independent of the Unicode specification, which does not assign numeric values to thesechar values.

  If the character does not have a numeric value, then -1 is returned. If the character has a numeric value that cannot be represented as a nonnegative integer (for example, a fractional value), then -2 is returned.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thegetNumericValue(int) method.

  Parameters:

  ch - the character to be converted.

  Returns:

  the numeric value of the character, as a nonnegativeint value; -2 if the character has a numeric value but the value can not be represented as a nonnegativeint value; -1 if the character has no numeric value.

  Since:

  1.1

  See Also:

  • forDigit(int, int)
  • isDigit(char)

• getNumericValue

  public static int getNumericValue(int codePoint)

  Returns theint value that the specified character (Unicode code point) represents. For example, the character'\u216C' (the Roman numeral fifty) will return anint with a value of 50.

  The letters A-Z in their uppercase ('\u0041' through'\u005A'), lowercase ('\u0061' through'\u007A'), and full width variant ('\uFF21' through'\uFF3A' and'\uFF41' through'\uFF5A') forms have numeric values from 10 through 35. This is independent of the Unicode specification, which does not assign numeric values to thesechar values.

  If the character does not have a numeric value, then -1 is returned. If the character has a numeric value that cannot be represented as a nonnegative integer (for example, a fractional value), then -2 is returned.

  Parameters:

  codePoint - the character (Unicode code point) to be converted.

  Returns:

  the numeric value of the character, as a nonnegativeint value; -2 if the character has a numeric value but the value can not be represented as a nonnegativeint value; -1 if the character has no numeric value.

  Since:

  1.5

  See Also:

  • forDigit(int, int)
  • isDigit(int)

• isSpace

  @Deprecated(since="1.1")public static boolean isSpace(char ch)

  Deprecated.

  Replaced by isWhitespace(char).

  Determines if the specified character is ISO-LATIN-1 white space. This method returnstrue for the following five characters only:

  truechars

  Character	Code	Name
  '\t'	U+0009	HORIZONTAL TABULATION
  '\n'	U+000A	NEW LINE
  '\f'	U+000C	FORM FEED
  '\r'	U+000D	CARRIAGE RETURN
  ' '	U+0020	SPACE

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is ISO-LATIN-1 white space;false otherwise.

  See Also:

  • isSpaceChar(char)
  • isWhitespace(char)

• isSpaceChar

  public static boolean isSpaceChar(char ch)

  Determines if the specified character is a Unicode space character. A character is considered to be a space character if and only if it is specified to be a space character by the Unicode Standard. This method returns true if the character's general category type is any of the following:

  • SPACE_SEPARATOR
  • LINE_SEPARATOR
  • PARAGRAPH_SEPARATOR

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisSpaceChar(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is a space character;false otherwise.

  Since:

  1.1

  See Also:

  • isWhitespace(char)

• isSpaceChar

  public static boolean isSpaceChar(int codePoint)

  Determines if the specified character (Unicode code point) is a Unicode space character. A character is considered to be a space character if and only if it is specified to be a space character by the Unicode Standard. This method returns true if the character's general category type is any of the following:

  • SPACE_SEPARATOR
  • LINE_SEPARATOR
  • PARAGRAPH_SEPARATOR

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a space character;false otherwise.

  Since:

  1.5

  See Also:

  • isWhitespace(int)

• isWhitespace

  public static boolean isWhitespace(char ch)

  Determines if the specified character is white space according to Java. A character is a Java whitespace character if and only if it satisfies one of the following criteria:

  • It is a Unicode space character (SPACE_SEPARATOR,LINE_SEPARATOR, orPARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0','\u2007','\u202F').
  • It is'\t', U+0009 HORIZONTAL TABULATION.
  • It is'\n', U+000A LINE FEED.
  • It is'\u000B', U+000B VERTICAL TABULATION.
  • It is'\f', U+000C FORM FEED.
  • It is'\r', U+000D CARRIAGE RETURN.
  • It is'\u001C', U+001C FILE SEPARATOR.
  • It is'\u001D', U+001D GROUP SEPARATOR.
  • It is'\u001E', U+001E RECORD SEPARATOR.
  • It is'\u001F', U+001F UNIT SEPARATOR.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisWhitespace(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is a Java whitespace character;false otherwise.

  Since:

  1.1

  See Also:

  • isSpaceChar(char)

• isWhitespace

  public static boolean isWhitespace(int codePoint)

  Determines if the specified character (Unicode code point) is white space according to Java. A character is a Java whitespace character if and only if it satisfies one of the following criteria:

  • It is a Unicode space character (SPACE_SEPARATOR,LINE_SEPARATOR, orPARAGRAPH_SEPARATOR) but is not also a non-breaking space ('\u00A0','\u2007','\u202F').
  • It is'\t', U+0009 HORIZONTAL TABULATION.
  • It is'\n', U+000A LINE FEED.
  • It is'\u000B', U+000B VERTICAL TABULATION.
  • It is'\f', U+000C FORM FEED.
  • It is'\r', U+000D CARRIAGE RETURN.
  • It is'\u001C', U+001C FILE SEPARATOR.
  • It is'\u001D', U+001D GROUP SEPARATOR.
  • It is'\u001E', U+001E RECORD SEPARATOR.
  • It is'\u001F', U+001F UNIT SEPARATOR.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is a Java whitespace character;false otherwise.

  Since:

  1.5

  See Also:

  • isSpaceChar(int)

• isISOControl

  public static boolean isISOControl(char ch)

  Determines if the specified character is an ISO control character. A character is considered to be an ISO control character if its code is in the range'\u0000' through'\u001F' or in the range'\u007F' through'\u009F'.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisISOControl(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  true if the character is an ISO control character;false otherwise.

  Since:

  1.1

  See Also:

  • isSpaceChar(char)
  • isWhitespace(char)

• isISOControl

  public static boolean isISOControl(int codePoint)

  Determines if the referenced character (Unicode code point) is an ISO control character. A character is considered to be an ISO control character if its code is in the range'\u0000' through'\u001F' or in the range'\u007F' through'\u009F'.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is an ISO control character;false otherwise.

  Since:

  1.5

  See Also:

  • isSpaceChar(int)
  • isWhitespace(int)

• getType

  public static int getType(char ch)

  Returns a value indicating a character's general category.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thegetType(int) method.

  Parameters:

  ch - the character to be tested.

  Returns:

  a value of typeint representing the character's general category.

  Since:

  1.1

  See Also:

  • COMBINING_SPACING_MARK
  • CONNECTOR_PUNCTUATION
  • CONTROL
  • CURRENCY_SYMBOL
  • DASH_PUNCTUATION
  • DECIMAL_DIGIT_NUMBER
  • ENCLOSING_MARK
  • END_PUNCTUATION
  • FINAL_QUOTE_PUNCTUATION
  • FORMAT
  • INITIAL_QUOTE_PUNCTUATION
  • LETTER_NUMBER
  • LINE_SEPARATOR
  • LOWERCASE_LETTER
  • MATH_SYMBOL
  • MODIFIER_LETTER
  • MODIFIER_SYMBOL
  • NON_SPACING_MARK
  • OTHER_LETTER
  • OTHER_NUMBER
  • OTHER_PUNCTUATION
  • OTHER_SYMBOL
  • PARAGRAPH_SEPARATOR
  • PRIVATE_USE
  • SPACE_SEPARATOR
  • START_PUNCTUATION
  • SURROGATE
  • TITLECASE_LETTER
  • UNASSIGNED
  • UPPERCASE_LETTER

• getType

  public static int getType(int codePoint)

  Returns a value indicating a character's general category.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  a value of typeint representing the character's general category.

  Since:

  1.5

  See Also:

  • COMBINING_SPACING_MARK
  • CONNECTOR_PUNCTUATION
  • CONTROL
  • CURRENCY_SYMBOL
  • DASH_PUNCTUATION
  • DECIMAL_DIGIT_NUMBER
  • ENCLOSING_MARK
  • END_PUNCTUATION
  • FINAL_QUOTE_PUNCTUATION
  • FORMAT
  • INITIAL_QUOTE_PUNCTUATION
  • LETTER_NUMBER
  • LINE_SEPARATOR
  • LOWERCASE_LETTER
  • MATH_SYMBOL
  • MODIFIER_LETTER
  • MODIFIER_SYMBOL
  • NON_SPACING_MARK
  • OTHER_LETTER
  • OTHER_NUMBER
  • OTHER_PUNCTUATION
  • OTHER_SYMBOL
  • PARAGRAPH_SEPARATOR
  • PRIVATE_USE
  • SPACE_SEPARATOR
  • START_PUNCTUATION
  • SURROGATE
  • TITLECASE_LETTER
  • UNASSIGNED
  • UPPERCASE_LETTER

• forDigit

  public static char forDigit(int digit, int radix)

  Determines the character representation for a specific digit in the specified radix. If the value ofradix is not a valid radix, or the value ofdigit is not a valid digit in the specified radix, the null character ('\u0000') is returned.

  Theradix argument is valid if it is greater than or equal toMIN_RADIX and less than or equal toMAX_RADIX. Thedigit argument is valid if0 <= digit < radix.

  If the digit is less than 10, then'0' + digit is returned. Otherwise, the value'a' + digit - 10 is returned.

  Parameters:

  digit - the number to convert to a character.

  radix - the radix.

  Returns:

  thechar representation of the specified digit in the specified radix.

  See Also:

  • MIN_RADIX
  • MAX_RADIX
  • digit(char, int)

• getDirectionality

  public static byte getDirectionality(char ch)

  Returns the Unicode directionality property for the given character. Character directionality is used to calculate the visual ordering of text. The directionality value of undefinedchar values isDIRECTIONALITY_UNDEFINED.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use thegetDirectionality(int) method.

  Parameters:

  ch -char for which the directionality property is requested.

  Returns:

  the directionality property of thechar value.

  Since:

  1.4

  See Also:

  • DIRECTIONALITY_UNDEFINED
  • DIRECTIONALITY_LEFT_TO_RIGHT
  • DIRECTIONALITY_RIGHT_TO_LEFT
  • DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC
  • DIRECTIONALITY_EUROPEAN_NUMBER
  • DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR
  • DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR
  • DIRECTIONALITY_ARABIC_NUMBER
  • DIRECTIONALITY_COMMON_NUMBER_SEPARATOR
  • DIRECTIONALITY_NONSPACING_MARK
  • DIRECTIONALITY_BOUNDARY_NEUTRAL
  • DIRECTIONALITY_PARAGRAPH_SEPARATOR
  • DIRECTIONALITY_SEGMENT_SEPARATOR
  • DIRECTIONALITY_WHITESPACE
  • DIRECTIONALITY_OTHER_NEUTRALS
  • DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING
  • DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE
  • DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING
  • DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE
  • DIRECTIONALITY_POP_DIRECTIONAL_FORMAT
  • DIRECTIONALITY_LEFT_TO_RIGHT_ISOLATE
  • DIRECTIONALITY_RIGHT_TO_LEFT_ISOLATE
  • DIRECTIONALITY_FIRST_STRONG_ISOLATE
  • DIRECTIONALITY_POP_DIRECTIONAL_ISOLATE

• getDirectionality

  public static byte getDirectionality(int codePoint)

  Returns the Unicode directionality property for the given character (Unicode code point). Character directionality is used to calculate the visual ordering of text. The directionality value of undefined character isDIRECTIONALITY_UNDEFINED.

  Parameters:

  codePoint - the character (Unicode code point) for which the directionality property is requested.

  Returns:

  the directionality property of the character.

  Since:

  1.5

  See Also:

  • DIRECTIONALITY_UNDEFINED
  • DIRECTIONALITY_LEFT_TO_RIGHT
  • DIRECTIONALITY_RIGHT_TO_LEFT
  • DIRECTIONALITY_RIGHT_TO_LEFT_ARABIC
  • DIRECTIONALITY_EUROPEAN_NUMBER
  • DIRECTIONALITY_EUROPEAN_NUMBER_SEPARATOR
  • DIRECTIONALITY_EUROPEAN_NUMBER_TERMINATOR
  • DIRECTIONALITY_ARABIC_NUMBER
  • DIRECTIONALITY_COMMON_NUMBER_SEPARATOR
  • DIRECTIONALITY_NONSPACING_MARK
  • DIRECTIONALITY_BOUNDARY_NEUTRAL
  • DIRECTIONALITY_PARAGRAPH_SEPARATOR
  • DIRECTIONALITY_SEGMENT_SEPARATOR
  • DIRECTIONALITY_WHITESPACE
  • DIRECTIONALITY_OTHER_NEUTRALS
  • DIRECTIONALITY_LEFT_TO_RIGHT_EMBEDDING
  • DIRECTIONALITY_LEFT_TO_RIGHT_OVERRIDE
  • DIRECTIONALITY_RIGHT_TO_LEFT_EMBEDDING
  • DIRECTIONALITY_RIGHT_TO_LEFT_OVERRIDE
  • DIRECTIONALITY_POP_DIRECTIONAL_FORMAT
  • DIRECTIONALITY_LEFT_TO_RIGHT_ISOLATE
  • DIRECTIONALITY_RIGHT_TO_LEFT_ISOLATE
  • DIRECTIONALITY_FIRST_STRONG_ISOLATE
  • DIRECTIONALITY_POP_DIRECTIONAL_ISOLATE

• isMirrored

  public static boolean isMirrored(char ch)

  Determines whether the character is mirrored according to the Unicode specification. Mirrored characters should have their glyphs horizontally mirrored when displayed in text that is right-to-left. For example,'\u0028' LEFT PARENTHESIS is semantically defined to be anopening parenthesis. This will appear as a "(" in text that is left-to-right but as a ")" in text that is right-to-left.

  Note: This method cannot handle supplementary characters. To support all Unicode characters, including supplementary characters, use theisMirrored(int) method.

  Parameters:

  ch -char for which the mirrored property is requested

  Returns:

  true if the char is mirrored,false if thechar is not mirrored or is not defined.

  Since:

  1.4

• isMirrored

  public static boolean isMirrored(int codePoint)

  Determines whether the specified character (Unicode code point) is mirrored according to the Unicode specification. Mirrored characters should have their glyphs horizontally mirrored when displayed in text that is right-to-left. For example,'\u0028' LEFT PARENTHESIS is semantically defined to be anopening parenthesis. This will appear as a "(" in text that is left-to-right but as a ")" in text that is right-to-left.

  Parameters:

  codePoint - the character (Unicode code point) to be tested.

  Returns:

  true if the character is mirrored,false if the character is not mirrored or is not defined.

  Since:

  1.5

• compareTo

  public int compareTo(Character anotherCharacter)

  Compares twoCharacter objects numerically.

  Specified by:

  compareTo in interface Comparable<Character>

  Parameters:

  anotherCharacter - theCharacter to be compared.

  Returns:

  the value0 if the argumentCharacter is equal to thisCharacter; a value less than0 if thisCharacter is numerically less than theCharacter argument; and a value greater than0 if thisCharacter is numerically greater than theCharacter argument (unsigned comparison). Note that this is strictly a numerical comparison; it is not locale-dependent.

  Since:

  1.2

• compare

  public static int compare(char x, char y)

  Compares twochar values numerically. The value returned is identical to what would be returned by:

      Character.valueOf(x).compareTo(Character.valueOf(y))

  Parameters:

  x - the firstchar to compare

  y - the secondchar to compare

  Returns:

  the value0 ifx == y; a value less than0 ifx < y; and a value greater than0 ifx > y

  Since:

  1.7

• reverseBytes

  public static char reverseBytes(char ch)

  Returns the value obtained by reversing the order of the bytes in the specifiedchar value.

  Parameters:

  ch - Thechar of which to reverse the byte order.

  Returns:

  the value obtained by reversing (or, equivalently, swapping) the bytes in the specifiedchar value.

  Since:

  1.5

• getName

  public static String getName(int codePoint)

  Returns the name of the specified charactercodePoint, or null if the code point isunassigned.

  If the specified character is not assigned a name by theUnicodeData file (part of the Unicode Character Database maintained by the Unicode Consortium), the returned name is the same as the result of the expression:

  Character.UnicodeBlock.of(codePoint).toString().replace('_', ' ') + " " + Integer.toHexString(codePoint).toUpperCase(Locale.ROOT);

  For thecodePoints in theUnicodeData file, the name returned by this method follows the naming scheme in the "Unicode Name Property" section of the Unicode Standard. For other code points, such as Hangul/Ideographs, The name generation rule above differs from the one defined in the Unicode Standard.

  Parameters:

  codePoint - the character (Unicode code point)

  Returns:

  the name of the specified character, or null if the code point is unassigned.

  Throws:

  IllegalArgumentException - if the specifiedcodePoint is not a valid Unicode code point.

  Since:

  1.7

• codePointOf

  public static int codePointOf(String name)

  Returns the code point value of the Unicode character specified by the given character name.

  If a character is not assigned a name by theUnicodeData file (part of the Unicode Character Database maintained by the Unicode Consortium), its name is defined as the result of the expression:

  Character.UnicodeBlock.of(codePoint).toString().replace('_', ' ') + " " + Integer.toHexString(codePoint).toUpperCase(Locale.ROOT);

  Thename matching is case insensitive, with any leading and trailing whitespace character removed. For the code points in theUnicodeData file, this method recognizes the name which conforms to the name defined in the "Unicode Name Property" section in the Unicode Standard. For other code points, this method recognizes the name generated withgetName(int) method.

  Parameters:

  name - the character name

  Returns:

  the code point value of the character specified by its name.

  Throws:

  IllegalArgumentException - if the specifiedname is not a valid character name.

  NullPointerException - ifname isnull

  Since:

  9