Movatterモバイル変換

Class Boolean

java.lang.Object
- java.lang.Boolean

All Implemented Interfaces:
Serializable,Comparable<Boolean>
```
public final classBooleanextendsObjectimplementsSerializable,Comparable<Boolean>
```
The Boolean class wraps a value of the primitive typeboolean in an object. An object of typeBoolean contains a single field whose type isboolean.
In addition, this class provides many methods for converting aboolean to aString and aString to aboolean, as well as other constants and methods useful when dealing with aboolean.
Since:
1.0
See Also:
Serialized Form

Field Summary

Fields
Modifier and Type	Field	Description
`staticBoolean`	`FALSE`	The`Boolean` object corresponding to the primitive value`false`.
`staticBoolean`	`TRUE`	The`Boolean` object corresponding to the primitive value`true`.
`staticClass<Boolean>`	`TYPE`	The Class object representing the primitive type boolean.

Constructor Summary

Constructors
Constructor	Description
`Boolean(boolean value)`	Deprecated. It is rarely appropriate to use this constructor.
`Boolean(String s)`	Deprecated. It is rarely appropriate to use this constructor.

Method Summary

All Methods Static Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`booleanValue()`	Returns the value of this`Boolean` object as a boolean primitive.
`static int`	`compare(boolean x, boolean y)`	Compares two`boolean` values.
`int`	`compareTo(Boolean b)`	Compares this`Boolean` instance with another.
`boolean`	`equals(Object obj)`	Returns`true` if and only if the argument is not`null` and is a`Boolean` object that represents the same`boolean` value as this object.
`static boolean`	`getBoolean(String name)`	Returns`true` if and only if the system property named by the argument exists and is equal to, ignoring case, the string`"true"`.
`int`	`hashCode()`	Returns a hash code for this`Boolean` object.
`static int`	`hashCode(boolean value)`	Returns a hash code for a`boolean` value; compatible with`Boolean.hashCode()`.
`static boolean`	`logicalAnd(boolean a, boolean b)`	Returns the result of applying the logical AND operator to the specified`boolean` operands.
`static boolean`	`logicalOr(boolean a, boolean b)`	Returns the result of applying the logical OR operator to the specified`boolean` operands.
`static boolean`	`logicalXor(boolean a, boolean b)`	Returns the result of applying the logical XOR operator to the specified`boolean` operands.
`static boolean`	`parseBoolean(String s)`	Parses the string argument as a boolean.
`String`	`toString()`	Returns a`String` object representing this Boolean's value.
`staticString`	`toString(boolean b)`	Returns a`String` object representing the specified boolean.
`staticBoolean`	`valueOf(boolean b)`	Returns a`Boolean` instance representing the specified`boolean` value.
`staticBoolean`	`valueOf(String s)`	Returns a`Boolean` with a value represented by the specified string.

Methods declared in class java.lang.Object
clone,finalize,getClass,notify,notifyAll,wait,wait,wait

- Field Detail
  - TRUE
```
public static final Boolean TRUE
```
    TheBoolean object corresponding to the primitive valuetrue.
  - FALSE
```
public static final Boolean FALSE
```
    TheBoolean object corresponding to the primitive valuefalse.
  - TYPE
```
public static final Class<Boolean> TYPE
```
    The Class object representing the primitive type boolean.
    Since:
    1.1
- Constructor Detail
  - Boolean
```
@Deprecated(since="9")public Boolean(boolean value)
```
    Deprecated.
    It is rarely appropriate to use this constructor. The static factoryvalueOf(boolean) is generally a better choice, as it is likely to yield significantly better space and time performance. Also consider using the final fieldsTRUE andFALSE if possible.
    Allocates aBoolean object representing thevalue argument.
    Parameters:
    value - the value of theBoolean.
  - Boolean
```
@Deprecated(since="9")public Boolean(String s)
```
    Deprecated.
    It is rarely appropriate to use this constructor. UseparseBoolean(String) to convert a string to aboolean primitive, or usevalueOf(String) to convert a string to aBoolean object.
    Allocates aBoolean object representing the valuetrue if the string argument is notnull and is equal, ignoring case, to the string"true". Otherwise, allocates aBoolean object representing the valuefalse.
    Parameters:
    s - the string to be converted to aBoolean.
- Method Detail
  - parseBoolean
```
public static boolean parseBoolean(String s)
```
    Parses the string argument as a boolean. Theboolean returned represents the valuetrue if the string argument is notnull and is equal, ignoring case, to the string"true". Otherwise, a false value is returned, including for a null argument.
    Example:Boolean.parseBoolean("True") returnstrue.
    Example:Boolean.parseBoolean("yes") returnsfalse.
    Parameters:
    s - theString containing the boolean representation to be parsed
    Returns:
    the boolean represented by the string argument
    Since:
    1.5
  - booleanValue
```
public boolean booleanValue()
```
    Returns the value of thisBoolean object as a boolean primitive.
    Returns:
    the primitiveboolean value of this object.
  - valueOf
```
public static Boolean valueOf(boolean b)
```
    Returns aBoolean instance representing the specifiedboolean value. If the specifiedboolean value istrue, this method returnsBoolean.TRUE; if it isfalse, this method returnsBoolean.FALSE. If a newBoolean instance is not required, this method should generally be used in preference to the constructorBoolean(boolean), as this method is likely to yield significantly better space and time performance.
    Parameters:
    b - a boolean value.
    Returns:
    aBoolean instance representingb.
    Since:
    1.4
  - valueOf
```
public static Boolean valueOf(String s)
```
    Returns aBoolean with a value represented by the specified string. TheBoolean returned represents a true value if the string argument is notnull and is equal, ignoring case, to the string"true". Otherwise, a false value is returned, including for a null argument.
    Parameters:
    s - a string.
    Returns:
    theBoolean value represented by the string.
  - toString
```
public static String toString(boolean b)
```
    Returns aString object representing the specified boolean. If the specified boolean istrue, then the string"true" will be returned, otherwise the string"false" will be returned.
    Parameters:
    b - the boolean to be converted
    Returns:
    the string representation of the specifiedboolean
    Since:
    1.4
  - toString
```
public String toString()
```
    Returns aString object representing this Boolean's value. If this object represents the valuetrue, a string equal to"true" is returned. Otherwise, a string equal to"false" is returned.
    Overrides:
    toString in class Object
    Returns:
    a string representation of this object.
  - hashCode
```
public int hashCode()
```
    Returns a hash code for thisBoolean object.
    Overrides:
    hashCode in class Object
    Returns:
    the integer1231 if this object representstrue; returns the integer1237 if this object representsfalse.
    See Also:
    Object.equals(java.lang.Object),System.identityHashCode(java.lang.Object)
  - hashCode
```
public static int hashCode(boolean value)
```
    Returns a hash code for aboolean value; compatible withBoolean.hashCode().
    Parameters:
    value - the value to hash
    Returns:
    a hash code value for aboolean value.
    Since:
    1.8
  - equals
```
public boolean equals(Object obj)
```
    Returnstrue if and only if the argument is notnull and is aBoolean object that represents the sameboolean value as this object.
    Overrides:
    equals in class Object
    Parameters:
    obj - the object to compare with.
    Returns:
    true if the Boolean objects represent the same value;false otherwise.
    See Also:
    Object.hashCode(),HashMap
  - getBoolean
```
public static boolean getBoolean(String name)
```
    Returnstrue if and only if the system property named by the argument exists and is equal to, ignoring case, the string"true". A system property is accessible throughgetProperty, a method defined by theSystem class.
    If there is no property with the specified name, or if the specified name is empty or null, thenfalse is returned.
    Parameters:
    name - the system property name.
    Returns:
    theboolean value of the system property.
    Throws:
    SecurityException - for the same reasons asSystem.getProperty
    See Also:
    System.getProperty(java.lang.String),System.getProperty(java.lang.String, java.lang.String)
  - compareTo
```
public int compareTo(Boolean b)
```
    Compares thisBoolean instance with another.
    Specified by:
    compareTo in interface Comparable<Boolean>
    Parameters:
    b - theBoolean instance to be compared
    Returns:
    zero if this object represents the same boolean value as the argument; a positive value if this object represents true and the argument represents false; and a negative value if this object represents false and the argument represents true
    Throws:
    NullPointerException - if the argument isnull
    Since:
    1.5
    See Also:
    Comparable
  - compare
```
public static int compare(boolean x,                          boolean y)
```
    Compares twoboolean values. The value returned is identical to what would be returned by:
    Boolean.valueOf(x).compareTo(Boolean.valueOf(y))
    Parameters:
    x - the firstboolean to compare
    y - the secondboolean to compare
    Returns:
    the value0 ifx == y; a value less than0 if!x && y; and a value greater than0 ifx && !y
    Since:
    1.7
  - logicalAnd
```
public static boolean logicalAnd(boolean a,                                 boolean b)
```
    Returns the result of applying the logical AND operator to the specifiedboolean operands.
    Parameters:
    a - the first operand
    b - the second operand
    Returns:
    the logical AND ofa andb
    Since:
    1.8
    See Also:
    BinaryOperator
  - logicalOr
```
public static boolean logicalOr(boolean a,                                boolean b)
```
    Returns the result of applying the logical OR operator to the specifiedboolean operands.
    Parameters:
    a - the first operand
    b - the second operand
    Returns:
    the logical OR ofa andb
    Since:
    1.8
    See Also:
    BinaryOperator
  - logicalXor
```
public static boolean logicalXor(boolean a,                                 boolean b)
```
    Returns the result of applying the logical XOR operator to the specifiedboolean operands.
    Parameters:
    a - the first operand
    b - the second operand
    Returns:
    the logical XOR ofa andb
    Since:
    1.8
    See Also:
    BinaryOperator

Movatterモバイル変換

Class Boolean

Field Summary

Constructor Summary

Method Summary

Methods declared in class java.lang.Object

Field Detail

TRUE

FALSE

TYPE

Constructor Detail

Boolean

Boolean

Method Detail

parseBoolean

booleanValue

valueOf

valueOf

toString

toString

hashCode

hashCode

equals

getBoolean

compareTo

compare

logicalAnd

logicalOr

logicalXor