Class DecimalFormat

java.lang.Object
java.text.Format
java.text.NumberFormat
java.text.DecimalFormat
All Implemented Interfaces:
Serializable,Cloneable
public classDecimalFormatextendsNumberFormat
DecimalFormat is a concrete subclass ofNumberFormat that formats decimal numbers in a localized manner. It has a variety of features designed to make it possible to parse and format numbers in any locale, including support for Western, Arabic, and Indic digits. It also supports different kinds of numbers, including integers (123), fixed-point numbers (123.4), scientific notation (1.23E4), percentages (12%), and currency amounts ($123).

Getting a DecimalFormat

To obtain a standard decimal format for a specific locale, including the default locale, it is recommended to call one of theNumberFormatfactory methods, such asNumberFormat.getInstance(). These factory methods may not always return aDecimalFormat depending on the locale-service provider implementation installed. Thus, to use an instance method defined byDecimalFormat, theNumberFormat returned by the factory method should be type checked before converted toDecimalFormat. If the installed locale-sensitive service implementation does not support the givenLocale, the parent locale chain will be looked up, and aLocale used that is supported.

If the factory methods are not desired, use one of the constructors such asDecimalFormat(String pattern). See thePattern section for more information on thepattern parameter.

Using DecimalFormat

The following is an example of formatting and parsing,
NumberFormat nFmt = NumberFormat.getCurrencyInstance(Locale.US);if (nFmt instanceof DecimalFormat dFmt) {    // pattern match to DecimalFormat to use setPositiveSuffix(String)    dFmt.setPositiveSuffix(" dollars");    dFmt.format(100000); // returns "$100,000.00 dollars"    dFmt.parse("$100,000.00 dollars"); // returns 100000}

Formatting and Parsing

Rounding

When formatting,DecimalFormat can adjust its rounding usingsetRoundingMode(RoundingMode). By default, it usesRoundingMode.HALF_EVEN.

Digits

When formatting,DecimalFormat uses the ten consecutive characters starting with the localized zero digit defined in theDecimalFormatSymbols object as digits.

When parsing, these digits as well as all Unicode decimal digits, as defined byCharacter.digit, are recognized.

Integer and Fraction Digit Limits

Implementation Requirements:
When formatting aNumber other thanBigInteger andBigDecimal,309 is used as the upper limit for integer digits, and340 as the upper limit for fraction digits. This occurs, even if one of theDecimalFormat getter methods, for example,getMinimumFractionDigits() returns a numerically greater value.

Special Values

  • Not a Number (NaN) is formatted as a string, which is typically given as "NaN". This string is determined byDecimalFormatSymbols.getNaN(). This is the only value for which the prefixes and suffixes are not attached.

  • Infinity is formatted as a string, which is typically given as "∞" (U+221E), with the positive or negative prefixes and suffixes attached. This string is determined byDecimalFormatSymbols.getInfinity().

  • Negative zero ("-0") parses to

    • BigDecimal(0) ifisParseBigDecimal() is true
    • Long(0) ifisParseBigDecimal() is false andisParseIntegerOnly() is true
    • Double(-0.0) if bothisParseBigDecimal() andisParseIntegerOnly() are false

Synchronization

Decimal formats are generally not synchronized. It is recommended to create separate format instances for each thread. If multiple threads access a format concurrently, it must be synchronized externally.

DecimalFormat Pattern

ADecimalFormat comprises apattern and a set ofsymbols. The pattern may be set directly usingapplyPattern(), or indirectly using the various API methods. The symbols are stored in a DecimalFormatSymbols object. When using theNumberFormat factory methods, the pattern and symbols are created from the locale-sensitive service implementation installed.

DecimalFormat patterns have the following syntax:

Pattern:PositivePatternPositivePattern ;NegativePatternPositivePattern:PrefixoptNumberSuffixoptNegativePattern:PrefixoptNumberSuffixoptPrefix:         Any characters except thespecial pattern charactersSuffix:         Any characters except thespecial pattern charactersNumber:IntegerExponentoptInteger .FractionExponentoptInteger:MinimumInteger         #         #Integer         # ,IntegerMinimumInteger:         0         0MinimumInteger         0 ,MinimumIntegerFraction:MinimumFractionoptOptionalFractionoptMinimumFraction:         0MinimumFractionoptOptionalFraction:         #OptionalFractionoptExponent:         EMinimumExponentMinimumExponent:         0MinimumExponentopt

Special Pattern Characters

The special characters in the table below are interpreted syntactically when used in the DecimalFormat pattern. They must be quoted, unless noted otherwise, if they are to appear in the prefix or suffix as literals.

The characters in theSymbol column are used in non-localized patterns. The corresponding characters in theLocalized Symbol column are used in localized patterns, with the characters inSymbol losing their syntactical meaning. Two exceptions are the currency sign (U+00A4) and quote (U+0027), which are not localized.

Non-localized patterns should be used when callingapplyPattern(String). Localized patterns should be used when callingapplyLocalizedPattern(String).

Chart showing symbol, location, localized, and meaning.
SymbolLocalized SymbolLocationMeaning
0DecimalFormatSymbols.getZeroDigit()NumberDigit
#DecimalFormatSymbols.getDigit()NumberDigit, zero shows as absent
.DecimalFormatSymbols.getDecimalSeparator()NumberDecimal separator or monetary decimal separator
- (U+002D)DecimalFormatSymbols.getMinusSign()NumberMinus sign
,DecimalFormatSymbols.getGroupingSeparator()NumberGrouping separator or monetary grouping separator
EDecimalFormatSymbols.getExponentSeparator()NumberSeparates mantissa and exponent in scientific notation. This value is case sensistive.Need not be quoted in prefix or suffix.
;DecimalFormatSymbols.getPatternSeparator()Subpattern boundarySeparates positive and negative subpatterns
%DecimalFormatSymbols.getPercent()Prefix or suffixMultiply by 100 and show as percentage
‰ (U+2030)DecimalFormatSymbols.getPerMill()Prefix or suffixMultiply by 1000 and show as per mille value
¤ (U+00A4) n/a (not localized)Prefix or suffixCurrency sign, replaced by currency symbol. If doubled, replaced by international currency symbol. If present in a pattern, the monetary decimal/grouping separators are used instead of the decimal/grouping separators.
' (U+0027) n/a (not localized)Prefix or suffixUsed to quote special characters in a prefix or suffix, for example,"'#'#" formats 123 to"#123". To create a single quote itself, use two in a row:"# o''clock".

Maximum Digits Derivation

For any givenDecimalFormat pattern, if the pattern is not in scientific notation, the maximum number of integer digits will not be derived from the pattern, and instead set toInteger.MAX_VALUE. Otherwise, if the pattern is in scientific notation, the maximum number of integer digits will be derived from the pattern. This derivation is detailed in theScientific Notation section.setMaximumIntegerDigits(int) can be used to manually adjust the maximum integer digits.

Negative Subpatterns

ADecimalFormat pattern contains a positive and negative subpattern, for example,"#,##0.00;(#,##0.00)". Each subpattern has a prefix, numeric part, and suffix. The negative subpattern is optional; if absent, then the positive subpattern prefixed with the minus sign'-' (U+002D HYPHEN-MINUS) is used as the negative subpattern. That is,"0.00" alone is equivalent to"0.00;-0.00". If there is an explicit negative subpattern, it serves only to specify the negative prefix and suffix; the number of digits, minimal digits, and other characteristics are all the same as the positive pattern. That means that"#,##0.0#;(#)" produces precisely the same behavior as"#,##0.0#;(#,##0.0#)".

The prefixes, suffixes, and various symbols used for infinity, digits, grouping separators, decimal separators, etc. may be set to arbitrary values, and they will appear properly during formatting. However, care must be taken that the symbols and strings do not conflict, or parsing will be unreliable. For example, either the positive and negative prefixes or the suffixes must be distinct forDecimalFormat.parse() to be able to distinguish positive from negative values. (If they are identical, thenDecimalFormat will behave as if no negative subpattern was specified.) Another example is that the decimal separator and grouping separator should be distinct characters, or parsing will be impossible.

Grouping Separator

The grouping separator is commonly used for thousands, but in some locales it separates ten-thousands. The grouping size is a constant number of digits between the grouping characters, such as 3 for 100,000,000 or 4 for 1,0000,0000. If you supply a pattern with multiple grouping characters, the interval between the last one and the end of the integer is the one that is used. For example,"#,##,###,####" =="######,####" =="##,####,####".

Scientific Notation

Numbers in scientific notation are expressed as the product of a mantissa and a power of ten, for example, 1234 can be expressed as 1.234 x 10^3. The mantissa is often in the range 1.0 ≤ x < 10.0, but it need not be.DecimalFormat can be instructed to format and parse scientific notationonly via a pattern; there is currently no factory method that creates a scientific notation format. In a pattern, the exponent character immediately followed by one or more digit characters indicates scientific notation. Example:"0.###E0" formats the number 1234 as"1.234E3".

  • The number of digit characters after the exponent character gives the minimum exponent digit count. There is no maximum. Negative exponents are formatted using the localized minus sign,not the prefix and suffix from the pattern. This allows patterns such as"0.###E0 m/s".
  • Themaximum integer digits is the sum of '0's and '#'s prior to the decimal point. Theminimum integer digits is the sum of the '0's prior to the decimal point. Themaximum fraction andminimum fraction digits follow the same rules, but apply to the digits after the decimal point but before the exponent. For example, the following pattern:"#00.0####E0" would have a minimum number of integer digits = 2("00") and a maximum number of integer digits = 3("#00"). It would have a minimum number of fraction digits = 1("0") and a maximum number of fraction digits= 5("0####").
  • The minimum and maximum number of integer digits are interpreted together:
    • If the maximum number of integer digits is greater than their minimum number and greater than 1, it forces the exponent to be a multiple of the maximum number of integer digits, and the minimum number of integer digits to be interpreted as 1. The most common use of this is to generateengineering notation, in which the exponent is a multiple of three, e.g.,"##0.#####E0". Using this pattern, the number 12345 formats to"12.345E3", and 123456 formats to"123.456E3".
    • Otherwise, the minimum number of integer digits is achieved by adjusting the exponent. Example: 0.00123 formatted with"00.###E0" yields"12.3E-4".
  • For a given number, the amount of significant digits in the mantissa can be calculated as such
    Mantissa Digits:         min(max(Minimum Pattern Digits, Original Number Digits), Maximum Pattern Digits)Minimum pattern Digits:Minimum Integer Digits +Minimum Fraction DigitsMaximum pattern Digits:Maximum Integer Digits +Maximum Fraction DigitsOriginal Number Digits:         The amount of significant digits in the number to be formatted
    This means that generally, a mantissa will have up to the combined maximum integer and fraction digits, if the original number itself has enough significant digits. However, if there are more minimum pattern digits than significant digits in the original number, the mantissa will have significant digits that equals the combined minimum integer and fraction digits. The number of significant digits does not affect parsing.

    It should be noted, that the integer portion of the mantissa will give any excess digits to the fraction portion, whether it be for precision or for satisfying the total amount of combined minimum digits.

    This behavior can be observed in the following example,

        DecimalFormat df = new DecimalFormat("#000.000##E0");    df.format(12); // returns "12.0000E0"    df.format(123456789) // returns "1.23456789E8"
  • Exponential patterns may not contain grouping separators.

Since:
1.1
External Specifications
See Also:

  • Constructor Details

  • Method Details

    • format

      public final StringBuffer format(Object number,StringBuffer toAppendTo,FieldPosition pos)
      Formats a number and appends the resulting text to the given string buffer. The number can be of any subclass ofNumber.
      Overrides:
      format in class NumberFormat
      Implementation Requirements:
      This implementation uses the maximum precision permitted.
      Parameters:
      number - the number to format
      toAppendTo - theStringBuffer to which the formatted text is to be appended
      pos - keeps track on the position of the field within the returned string. For example, for formatting a number1234567.89 inLocale.US locale, if the givenfieldPosition isNumberFormat.INTEGER_FIELD, the begin index and end index offieldPosition will be set to 0 and 9, respectively for the output string1,234,567.89.
      Returns:
      the value passed in astoAppendTo
      Throws:
      IllegalArgumentException - ifnumber is null or not an instance ofNumber.
      NullPointerException - iftoAppendTo orpos is null
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      See Also:

    • format

      public StringBuffer format(double number,StringBuffer result,FieldPosition fieldPosition)
      Formats a double to produce a string.
      Specified by:
      format in class NumberFormat
      Parameters:
      number - The double to format
      result - where the text is to be appended
      fieldPosition - keeps track on the position of the field within the returned string. For example, for formatting a number1234567.89 inLocale.US locale, if the givenfieldPosition isNumberFormat.INTEGER_FIELD, the begin index and end index offieldPosition will be set to 0 and 9, respectively for the output string1,234,567.89.
      Returns:
      The formatted number string
      Throws:
      NullPointerException - ifresult orfieldPosition isnull
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      See Also:

    • format

      public StringBuffer format(long number,StringBuffer result,FieldPosition fieldPosition)
      Format a long to produce a string.
      Specified by:
      format in class NumberFormat
      Parameters:
      number - The long to format
      result - where the text is to be appended
      fieldPosition - keeps track on the position of the field within the returned string. For example, for formatting a number123456789 inLocale.US locale, if the givenfieldPosition isNumberFormat.INTEGER_FIELD, the begin index and end index offieldPosition will be set to 0 and 11, respectively for the output string123,456,789.
      Returns:
      The formatted number string
      Throws:
      NullPointerException - ifresult orfieldPosition isnull
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      See Also:

    • formatToCharacterIterator

      public AttributedCharacterIterator formatToCharacterIterator(Object obj)
      Formats an Object producing anAttributedCharacterIterator. You can use the returnedAttributedCharacterIterator to build the resulting String, as well as to determine information about the resulting String.

      Each attribute key of the AttributedCharacterIterator will be of typeNumberFormat.Field, with the attribute value being the same as the attribute key.

      Overrides:
      formatToCharacterIterator in class Format
      Parameters:
      obj - The object to format
      Returns:
      AttributedCharacterIterator describing the formatted value.
      Throws:
      NullPointerException - if obj is null.
      IllegalArgumentException - when the Format cannot format the given object.
      ArithmeticException - if rounding is needed with rounding mode being set to RoundingMode.UNNECESSARY
      Since:
      1.4

    • parse

      public Number parse(String text,ParsePosition pos)
      Parses text from the beginning of the given string to produce aNumber.

      This method attempts to parse text starting at the index given by theParsePosition. If parsing succeeds, then the index of the ParsePosition is updated to the index after the last character used (parsing does not necessarily use all characters up to the end of the string), and the parsed number is returned. The updated ParsePosition can be used to indicate the starting point for the next call to this method. If an error occurs, then the index of theParsePosition is not changed, the error index of theParsePosition is set to the index of the character where the error occurred, andnull is returned.

      This method will return a Long if possible (e.g., within the range [Long.MIN_VALUE, Long.MAX_VALUE] and with no decimals), otherwise a Double.

      Parsing can be done in either a strict or lenient manner, by default it is lenient.

      Parsing fails whenlenient, if the prefix and/or suffix are non-empty and cannot be found due to parsing ending early, or the first character after the prefix cannot be parsed.

      Parsing fails whenstrict, if intext,

      • The prefix is not found. For example, aLocale.US currency format prefix: "$"
      • The suffix is not found. For example, aLocale.US percent format suffix: "%"
      • NumberFormat.isGroupingUsed() returnstrue, andgetGroupingSize() is not adhered to
      • NumberFormat.isGroupingUsed() returnsfalse, and the grouping symbol is found
      • NumberFormat.isGroupingUsed() returnstrue and the grouping symbol occurs after the decimal separator
      • Any other characters are found, that are not the expected symbols, and are not digits that occur within the numerical portion

      The subclass returned depends on the value ofisParseBigDecimal() as well as on the string being parsed.

      • IfisParseBigDecimal() is false (the default), most integer values are returned asLong objects, no matter how they are written:"17" and"17.000" both parse toLong(17). Values that cannot fit into aLong are returned asDoubles. This includes values with a fractional part, infinite values,NaN, and the value -0.0.DecimalFormat doesnot decide whether to return aDouble or aLong based on the presence of a decimal separator in the source string. Doing so would prevent integers that overflow the mantissa of a double, such as"-9,223,372,036,854,775,808.00", from being parsed accurately.

        Callers may use theNumber methodsdoubleValue,longValue, etc., to obtain the type they want.

      • IfisParseBigDecimal() is true, values are returned asBigDecimal objects. The values are the ones constructed byBigDecimal(String) for corresponding strings in locale-independent format. The special cases negative and positive infinity and NaN are returned asDouble instances holding the values of the correspondingDouble constants.

      DecimalFormat parses all Unicode characters that represent decimal digits, as defined byCharacter.digit(). In addition,DecimalFormat also recognizes as digits the ten consecutive characters starting with the localized zero digit defined in theDecimalFormatSymbols object.

      Specified by:
      parse in class NumberFormat
      Parameters:
      text - the string to be parsed
      pos - AParsePosition object with index and error index information as described above.
      Returns:
      the parsed value, ornull if the parse fails
      Throws:
      NullPointerException - iftext orpos is null.
      See Also:

    • getDecimalFormatSymbols

      public DecimalFormatSymbols getDecimalFormatSymbols()
      Returns a copy of the decimal format symbols, which is generally not changed by the programmer or user.
      Returns:
      a copy of the desired DecimalFormatSymbols
      See Also:

    • setDecimalFormatSymbols

      public void setDecimalFormatSymbols(DecimalFormatSymbols newSymbols)
      Sets the decimal format symbols, which is generally not changed by the programmer or user.
      Parameters:
      newSymbols - desired DecimalFormatSymbols
      See Also:

    • getPositivePrefix

      public String getPositivePrefix()
      Get the positive prefix.

      Examples: +123, $123, sFr123

      Returns:
      the positive prefix

    • setPositivePrefix

      public void setPositivePrefix(String newValue)
      Set the positive prefix.

      Examples: +123, $123, sFr123

      Parameters:
      newValue - the new positive prefix

    • getNegativePrefix

      public String getNegativePrefix()
      Get the negative prefix.

      Examples: -123, ($123) (with negative suffix), sFr-123

      Returns:
      the negative prefix

    • setNegativePrefix

      public void setNegativePrefix(String newValue)
      Set the negative prefix.

      Examples: -123, ($123) (with negative suffix), sFr-123

      Parameters:
      newValue - the new negative prefix

    • getPositiveSuffix

      public String getPositiveSuffix()
      Get the positive suffix.

      Example: 123%

      Returns:
      the positive suffix

    • setPositiveSuffix

      public void setPositiveSuffix(String newValue)
      Set the positive suffix.

      Example: 123%

      Parameters:
      newValue - the new positive suffix

    • getNegativeSuffix

      public String getNegativeSuffix()
      Get the negative suffix.

      Examples: -123%, ($123) (with positive suffixes)

      Returns:
      the negative suffix

    • setNegativeSuffix

      public void setNegativeSuffix(String newValue)
      Set the negative suffix.

      Examples: 123%

      Parameters:
      newValue - the new negative suffix

    • getMultiplier

      public int getMultiplier()
      Gets the multiplier for use in percent, per mille, and similar formats.
      Returns:
      the multiplier
      See Also:

    • setMultiplier

      public void setMultiplier(int newValue)
      Sets the multiplier for use in percent, per mille, and similar formats. For a percent format, set the multiplier to 100 and the suffixes to have '%' (for Arabic, use the Arabic percent sign). For a per mille format, set the multiplier to 1000 and the suffixes to have 'U+2030'.

      Example: with multiplier 100, 1.23 is formatted as "123", and "123" is parsed into 1.23. IfisParseIntegerOnly() returnstrue, "123" is parsed into 1.

      Parameters:
      newValue - the new multiplier
      See Also:

    • getGroupingSize

      public int getGroupingSize()
      Return the grouping size. Grouping size is the number of digits between grouping separators in the integer portion of a number. For example, in the number "123,456.78", the grouping size is 3. Grouping size of zero designates that grouping is not used, which provides the same formatting as if callingsetGroupingUsed(false).
      Returns:
      the grouping size
      See Also:

    • setGroupingSize

      public void setGroupingSize(int newValue)
      Set the grouping size. Grouping size is the number of digits between grouping separators in the integer portion of a number. For example, in the number "123,456.78", the grouping size is 3. Grouping size of zero designates that grouping is not used, which provides the same formatting as if callingsetGroupingUsed(false).

      The value passed in is converted to a byte, which may lose information. Values that are negative or greater thanByte.MAX_VALUE, will throw anIllegalArgumentException.

      Parameters:
      newValue - the new grouping size
      Throws:
      IllegalArgumentException - ifnewValue is negative or greater thanByte.MAX_VALUE
      See Also:

    • isDecimalSeparatorAlwaysShown

      public boolean isDecimalSeparatorAlwaysShown()
      Allows you to get the behavior of the decimal separator with integers. (The decimal separator will always appear with decimals.)

      Example: Decimal ON: 12345 → 12345.; OFF: 12345 → 12345

      Returns:
      true if the decimal separator is always shown;false otherwise

    • setDecimalSeparatorAlwaysShown

      public void setDecimalSeparatorAlwaysShown(boolean newValue)
      Allows you to set the behavior of the decimal separator with integers. (The decimal separator will always appear with decimals.)

      Example: Decimal ON: 12345 → 12345.; OFF: 12345 → 12345

      Parameters:
      newValue -true if the decimal separator is always shown;false otherwise

    • isStrict

      public boolean isStrict()
      Returnstrue if this format will parse numbers strictly;false otherwise.
      Overrides:
      isStrict in class NumberFormat
      Returns:
      true if this format will parse numbers strictly;false otherwise
      Since:
      23
      See Also:

    • setStrict

      public void setStrict(boolean strict)
      Change the leniency value for parsing. Parsing can either be strict or lenient, by default it is lenient.
      Overrides:
      setStrict in class NumberFormat
      Parameters:
      strict -true if parsing should be done strictly;false otherwise
      Since:
      23
      See Also:

    • isParseBigDecimal

      public boolean isParseBigDecimal()
      Returns whether theparse(java.lang.String, java.text.ParsePosition) method returnsBigDecimal. The default value is false.
      Returns:
      true if the parse method returns BigDecimal;false otherwise
      Since:
      1.5
      See Also:

    • setParseBigDecimal

      public void setParseBigDecimal(boolean newValue)
      Sets whether theparse(java.lang.String, java.text.ParsePosition) method returnsBigDecimal.
      Parameters:
      newValue -true if the parse method returns BigDecimal;false otherwise
      Since:
      1.5
      See Also:

    • clone

      public Object clone()
      Standard override; no change in semantics.
      Overrides:
      clone in class NumberFormat
      Returns:
      a clone of this instance.
      See Also:

    • equals

      public boolean equals(Object obj)
      Compares the specified object with thisDecimalFormat for equality. Returns true if the object is also aDecimalFormat and the two formats would format any value the same.
      Overrides:
      equals in class NumberFormat
      Implementation Requirements:
      This method performs an equality check with a notion of class identity based ongetClass(), rather thaninstanceof. Therefore, in the equals methods in subclasses, no instance of this class should compare as equal to an instance of a subclass.
      Parameters:
      obj - object to be compared for equality
      Returns:
      true if the specified object is equal to thisDecimalFormat
      See Also:

    • hashCode

      public int hashCode()
      Returns the hash code for thisDecimalFormat.
      Overrides:
      hashCode in class NumberFormat
      Implementation Requirements:
      This method calculates the hash code value using the values returned fromgetPositivePrefix() andNumberFormat.hashCode().
      Returns:
      the hash code for thisDecimalFormat
      See Also:

    • toString

      public String toString()
      Returns a string identifying thisDecimalFormat, for debugging.
      Overrides:
      toString in class Object
      Returns:
      a string identifying thisDecimalFormat, for debugging

    • toPattern

      public String toPattern()
      Synthesizes a pattern string that represents the current state of this Format object.
      Returns:
      a pattern string
      See Also:

    • toLocalizedPattern

      public String toLocalizedPattern()
      Synthesizes a localized pattern string that represents the current state of this Format object.
      Returns:
      a localized pattern string
      See Also:

    • applyPattern

      public void applyPattern(String pattern)
      Apply the given pattern to this Format object. A pattern is a short-hand specification for the various formatting properties. These properties can also be changed individually through the various setter methods.

      The number of maximum integer digits is usually not derived from the pattern. See the note in thePatterns section for more detail. For negative numbers, use a second pattern, separated by a semicolon

      Example"#,#00.0#" → 1,234.56

      This means a minimum of 2 integer digits, 1 fraction digit, and a maximum of 2 fraction digits.

      Example:"#,#00.0#;(#,#00.0#)" for negatives in parentheses.

      In negative patterns, the minimum and maximum counts are ignored; these are presumed to be set in the positive pattern.

      Parameters:
      pattern - a new pattern
      Throws:
      NullPointerException - ifpattern is null
      IllegalArgumentException - if the given pattern is invalid.

    • applyLocalizedPattern

      public void applyLocalizedPattern(String pattern)
      Apply the given pattern to this Format object. The pattern is assumed to be in a localized notation. A pattern is a short-hand specification for the various formatting properties. These properties can also be changed individually through the various setter methods.

      The number of maximum integer digits is usually not derived from the pattern. See the note in thePatterns section for more detail. For negative numbers, use a second pattern, separated by a semicolon

      Example"#,#00.0#" → 1,234.56

      This means a minimum of 2 integer digits, 1 fraction digit, and a maximum of 2 fraction digits.

      Example:"#,#00.0#;(#,#00.0#)" for negatives in parentheses.

      In negative patterns, the minimum and maximum counts are ignored; these are presumed to be set in the positive pattern.

      Parameters:
      pattern - a new pattern
      Throws:
      NullPointerException - ifpattern is null
      IllegalArgumentException - if the given pattern is invalid.

    • setMaximumIntegerDigits

      public void setMaximumIntegerDigits(int newValue)
      Sets the maximum number of digits allowed in the integer portion of a number. Negative input values are replaced with 0.
      Overrides:
      setMaximumIntegerDigits in class NumberFormat
      Parameters:
      newValue - the maximum number of integer digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
      See Also:

    • setMinimumIntegerDigits

      public void setMinimumIntegerDigits(int newValue)
      Sets the minimum number of digits allowed in the integer portion of a number. Negative input values are replaced with 0.
      Overrides:
      setMinimumIntegerDigits in class NumberFormat
      Parameters:
      newValue - the minimum number of integer digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
      See Also:

    • setMaximumFractionDigits

      public void setMaximumFractionDigits(int newValue)
      Sets the maximum number of digits allowed in the fraction portion of a number. Negative input values are replaced with 0.
      Overrides:
      setMaximumFractionDigits in class NumberFormat
      Parameters:
      newValue - the maximum number of fraction digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
      See Also:

    • setMinimumFractionDigits

      public void setMinimumFractionDigits(int newValue)
      Sets the minimum number of digits allowed in the fraction portion of a number. Negative input values are replaced with 0.
      Overrides:
      setMinimumFractionDigits in class NumberFormat
      Parameters:
      newValue - the minimum number of fraction digits to be shown; if less than zero, then zero is used. The concrete subclass may enforce an upper limit to this value appropriate to the numeric type being formatted.
      See Also:

    • getMaximumIntegerDigits

      public int getMaximumIntegerDigits()
      Gets the maximum number of digits allowed in the integer portion of a number. The maximum number of integer digits can be set by eithersetMaximumIntegerDigits(int) orapplyPattern(String). See thePattern Section for comprehensive rules regarding maximum integer digits in patterns.
      Overrides:
      getMaximumIntegerDigits in class NumberFormat
      Returns:
      the maximum number of digits
      See Also:

    • getMinimumIntegerDigits

      public int getMinimumIntegerDigits()
      Gets the minimum number of digits allowed in the integer portion of a number.
      Overrides:
      getMinimumIntegerDigits in class NumberFormat
      Returns:
      the minimum number of digits
      See Also:

    • getMaximumFractionDigits

      public int getMaximumFractionDigits()
      Gets the maximum number of digits allowed in the fraction portion of a number.
      Overrides:
      getMaximumFractionDigits in class NumberFormat
      Returns:
      the maximum number of digits.
      See Also:

    • getMinimumFractionDigits

      public int getMinimumFractionDigits()
      Gets the minimum number of digits allowed in the fraction portion of a number.
      Overrides:
      getMinimumFractionDigits in class NumberFormat
      Returns:
      the minimum number of digits
      See Also:

    • getCurrency

      public Currency getCurrency()
      Gets the currency used by this decimal format when formatting currency values. The currency is obtained by callingDecimalFormatSymbols.getCurrency on this number format's symbols.
      Overrides:
      getCurrency in class NumberFormat
      Returns:
      the currency used by this decimal format, ornull
      Since:
      1.4

    • setCurrency

      public void setCurrency(Currency currency)
      Sets the currency used by this number format when formatting currency values. This does not update the minimum or maximum number of fraction digits used by the number format. The currency is set by callingDecimalFormatSymbols.setCurrency on this number format's symbols.
      Overrides:
      setCurrency in class NumberFormat
      Parameters:
      currency - the new currency to be used by this decimal format
      Throws:
      NullPointerException - ifcurrency is null
      Since:
      1.4

    • getRoundingMode

      public RoundingMode getRoundingMode()
      Gets theRoundingMode used in this DecimalFormat.
      Overrides:
      getRoundingMode in class NumberFormat
      Returns:
      TheRoundingMode used for this DecimalFormat.
      Since:
      1.6
      See Also:

    • setRoundingMode

      public void setRoundingMode(RoundingMode roundingMode)
      Sets theRoundingMode used in this DecimalFormat.
      Overrides:
      setRoundingMode in class NumberFormat
      Parameters:
      roundingMode - TheRoundingMode to be used
      Throws:
      NullPointerException - ifroundingMode is null.
      Since:
      1.6
      See Also: