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§1.1 Class Boolean

public  final  class  java.lang.Boolean
    extends  java.lang.Object  (I-§1.12)
{
        // Fields
    public final static Boolean FALSE;	§1.1.1
    public final static Boolean TRUE;	§1.1.2

        // Constructors
    public Boolean(boolean  value);	§1.1.3
    public Boolean(String  s);	§1.1.4

        // Methods
    public boolean booleanValue();	§1.1.5
    public boolean equals(Object  obj);	§1.1.6
    public static boolean  getBoolean(String  name);	§1.1.7
    public int hashCode();	§1.1.8
    public String toString();	§1.1.9
    public static Boolean valueOf(String  s);	§1.1.10
}
This class wraps a value of the primitive type boolean in an object. An object of type Boolean contains a single field whose type is boolean.

In addition, this class provides a number of 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.


Fields

FALSE

public final static Boolean FALSE = new Boolean(false)
The Boolean object corresponding to the primitive value false.

TRUE

public final static Boolean TRUE = new Boolean(true)
The Boolean object corresponding to the primitive value true.

Constructors

Boolean

public Boolean(boolean value)
Allocates a Boolean object representing the value argument.
Parameters:
value - the value of the boolean

Boolean

public Boolean(String s)
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, allocate a Boolean object representing the value false.
Parameters:
s - the string to be converted to a Boolean

Methods

booleanValue

public boolean booleanValue()
Returns:
the primitive boolean value of this object.

equals

public boolean equals(Object obj)
The result is true if and only if the argument is not null and is a Boolean object that contains the same boolean value as this object.
Parameters:
obj - the object to compare with
Returns:
true if the objects are the same; false otherwise.
Overrides:
equals in class Object (I-§1.12.3).

getBoolean

public static boolean getBoolean(String name)
The result is true if and only if the system property (I-§1.18.9) named by the argument exists and is equal, ignoring case1, to the string "true".

Parameters:
name - the system property name
Returns:
the boolean value of the system property.

hashCode

public int hashCode()
Returns:
a hash code value for this object.
Overrides:
hashCode in class Object (I-§1.12.6).

toString

public String toString()
If this object contains the value true, a string equal to "true" is returned. Otherwise, a string equal to "false" is returned.
Returns:
a string representation of this object.
Overrides:
toString in class Object (I-§1.12.9).

valueOf

public static Boolean valueOf(String s)
A new Boolean object is constructed. This Boolean contains the value true if the string argument is not null and is equal, ignoring case, to the string "true".
Parameters:
s - a string
Returns:
The Boolean value represented by the string.

1 In Java 1.0, the string had to be equal to the string "true", where the comparison was case sensitive. Beginning with Java 1.1, the test is case insensitive.

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Java API Document (HTML generated by dkramer on April 22, 1996)
Copyright © 1996 Sun Microsystems, Inc. All rights reserved
Please send any comments or corrections to doug.kramer@sun.com