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Showing content from https://docs.oracle.com/en/java/javase/20/docs/api/java.base/java/util/../lang/Boolean.html below:

Boolean (Java SE 20 & JDK 20)

All Implemented Interfaces:

Serializable, Comparable<Boolean>, Constable

The Boolean class wraps a value of the primitive type

in an object. An object of type

contains a single field whose type is

.

In addition, this class provides many methods for converting a boolean to a String and a String to a boolean, as well as other constants and methods useful when dealing with a boolean.

This is a value-based class; programmers should treat instances that are equal as interchangeable and should not use instances for synchronization, or unpredictable behavior may occur. For example, in a future release, synchronization may fail.

Since:

1.0

See Also:

• Serialized Form

• Field Summary

  Fields

  The Boolean object corresponding to the primitive value false.

  The Boolean object corresponding to the primitive value true.

  The Class object representing the primitive type boolean.

• Constructor Summary

  Constructors

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

  boolean

  Returns the value of this Boolean object as a boolean primitive.

  static int

  Compares two boolean values.

  int

  Compares this Boolean instance with another.

  Returns an

  Optional

  containing the nominal descriptor for this instance.

  boolean

  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

  Returns true if and only if the system property named by the argument exists and is equal to, ignoring case, the string "true".

  int

  Returns a hash code for this Boolean object.

  static int

  Returns a hash code for a boolean value; compatible with Boolean.hashCode().

  static boolean

  Returns the result of applying the logical AND operator to the specified boolean operands.

  static boolean

  Returns the result of applying the logical OR operator to the specified boolean operands.

  static boolean

  Returns the result of applying the logical XOR operator to the specified boolean operands.

  static boolean

  Parses the string argument as a boolean.

  Returns a String object representing this Boolean's value.

  Returns a String object representing the specified boolean.

  Returns a Boolean instance representing the specified boolean value.

  Returns a Boolean with a value represented by the specified string.

• Field Details
  • TRUE

    The Boolean object corresponding to the primitive value true.

  • FALSE

    The Boolean object corresponding to the primitive value false.

  • TYPE

    The Class object representing the primitive type boolean.

    Since:

    1.1

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

    Allocates a Boolean object representing the value argument.

    Parameters:

    value - the value of the Boolean.

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

    Allocates a Boolean object representing the value true if the string argument is not null and is equal, ignoring case, to the string "true". Otherwise, allocates a Boolean object representing the value false.

    Parameters:

    s - the string to be converted to a Boolean.

• Method Details
  • parseBoolean public static boolean parseBoolean(String s)

    Parses the string argument as a boolean. The

    boolean

    returned represents the value

    true

    if the string argument is not

    null

    and is equal, ignoring case, to the string

    "true"

    . Otherwise, a false value is returned, including for a null argument.

    Example: Boolean.parseBoolean("True") returns true.
    Example: Boolean.parseBoolean("yes") returns false.

    Parameters:

    s - the String 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 this Boolean object as a boolean primitive.

    Returns:

    the primitive boolean value of this object.

  • valueOf public static Boolean valueOf(boolean b)

    Returns a

    Boolean

    instance representing the specified

    boolean

    value. If the specified

    boolean

    value is

    true

    , this method returns

    Boolean.TRUE

    ; if it is

    false

    , this method returns

    Boolean.FALSE

    . If a new

    Boolean

    instance is not required, this method should generally be used in preference to the constructor

    Boolean(boolean)

    , as this method is likely to yield significantly better space and time performance.

    Parameters:

    b - a boolean value.

    Returns:

    a Boolean instance representing b.

    Since:

    1.4

  • valueOf

    Returns a Boolean with a value represented by the specified string. The Boolean returned represents a true value if the string argument is not null 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:

    the Boolean value represented by the string.

  • toString public static String toString(boolean b)

    Returns a String object representing the specified boolean. If the specified boolean is true, 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 specified boolean

    Since:

    1.4

  • toString

    Returns a String object representing this Boolean's value. If this object represents the value true, 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 this Boolean object.

    Overrides:

    hashCode in class Object

    Returns:

    the integer 1231 if this object represents true; returns the integer 1237 if this object represents false.

    See Also:

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

  • hashCode

    public static int hashCode(boolean value)

    Returns a hash code for a boolean value; compatible with Boolean.hashCode().

    Parameters:

    value - the value to hash

    Returns:

    a hash code value for a boolean value.

    Since:

    1.8

  • equals public 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.

    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)

    Returns

    true

    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 through

    getProperty

    , a method defined by the

    System

    class.

    If there is no property with the specified name, or if the specified name is empty or null, then false is returned.

    Parameters:

    name - the system property name.

    Returns:

    the boolean value of the system property.

    Throws:

    SecurityException - for the same reasons as System.getProperty

    See Also:

    • System.getProperty(java.lang.String)
    • System.getProperty(java.lang.String, java.lang.String)

  • compareTo

    Compares this Boolean instance with another.

    Specified by:

    compareTo in interface Comparable<Boolean>

    Parameters:

    b - the Boolean 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 is null

    Since:

    1.5

    See Also:

    • Comparable

  • compare

    public static int compare(boolean x, boolean y)

    Compares two

    boolean

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

        Boolean.valueOf(x).compareTo(Boolean.valueOf(y))
     

    Parameters:

    x - the first boolean to compare

    y - the second boolean to compare

    Returns:

    the value 0 if x == y; a value less than 0 if !x && y; and a value greater than 0 if x && !y

    Since:

    1.7

  • logicalAnd

    public static boolean logicalAnd(boolean a, boolean b)

    Returns the result of applying the logical AND operator to the specified boolean operands.

    Parameters:

    a - the first operand

    b - the second operand

    Returns:

    the logical AND of a and b

    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 specified boolean operands.

    Parameters:

    a - the first operand

    b - the second operand

    Returns:

    the logical OR of a and b

    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 specified boolean operands.

    Parameters:

    a - the first operand

    b - the second operand

    Returns:

    the logical XOR of a and b

    Since:

    1.8

    See Also:

    • BinaryOperator

  • describeConstable

    Returns an

    Optional

    containing the nominal descriptor for this instance.

    Specified by:

    describeConstable in interface Constable

    Returns:

    an Optional describing the Boolean instance

    Since:

    15

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