Class java.lang.Boolean 
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Class java.lang.Boolean 

Object
   |
   +----java.lang.Boolean
public final class Boolean
extends Object
implements Serializable
The Boolean 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 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.

Version:
1.28, 07/07/98
Author:
Arthur van Hoff
Since:
JDK1.0

Variable Index

o FALSE
The Boolean object corresponding to the primitive value false.
o TRUE
The Boolean object corresponding to the primitive value true.
o TYPE
The Class object representing the primitive type boolean.

Constructor Index

o java.lang.Boolean(boolean)
Allocates a Boolean object representing the value argument.
o java.lang.Boolean(String)
Allocates a Boolean object representing the value true if the string argument is not null and is equal, ignoring case, to the string "true".

Method Index

o booleanValue()
Returns the value of this Boolean object as a boolean.
o equals(Object)
Returns true if and only if the argument is not null and is a Boolean object that contains the same boolean value as this object.
o getBoolean(String)
Returns is true if and only if the system property named by the argument exists and is equal to the string "true".
o hashCode()
Returns a hash code for this Boolean.
o toString()
Returns a String object representing this Boolean's value.
o valueOf(String)
Returns the boolean value represented by the specified String.

Variables

o FALSE 
public static final java.lang.Boolean FALSE
The Boolean object corresponding to the primitive value false.

Since: JDK1.0
o TRUE 
public static final java.lang.Boolean TRUE
The Boolean object corresponding to the primitive value true.

Since: JDK1.0
o TYPE 
public static final java.lang.Class TYPE
The Class object representing the primitive type boolean.

Since: JDK1.1

Constructors

o Boolean 
public Boolean(boolean value)
Allocates a Boolean object representing the value argument.

Parameters:
value - the value of the Boolean.
Since:
JDK1.0
o 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.
Since:
JDK1.0

Methods

o booleanValue 
public boolean booleanValue()
Returns the value of this Boolean object as a boolean.

Returns:
the primitive boolean value of this object.
Since:
JDK1.0
o equals 
public boolean equals(Object obj)
Returns 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
Since:
JDK1.0
o getBoolean 
public static boolean getBoolean(String name)
Returns is true if and only if the system property named by the argument exists and is equal to the string "true". (Beginning with Java 1.0.2, the test of this string is case insensitive.) A system property is accessible through getProperty, a method defined by the System class.

Parameters:
name - the system property name.
Returns:
the boolean value of the system property.
Since:
JDK1.0
See Also:
getProperty(java.lang.String), getProperty(java.lang.String, java.lang.String)
o hashCode 
public int hashCode()
Returns a hash code for this Boolean.

Returns:
a hash code value for this object.
Overrides:
hashCode in class Object
Since:
JDK1.0
o toString 
public java.lang.String toString()
Returns a String object representing this Boolean's value. 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
Since:
JDK1.0
o valueOf 
public static java.lang.Boolean valueOf(String s)
Returns the boolean value represented by the specified String. 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.
Since:
JDK1.0 
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