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Java Platform 1.2
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Class java.lang.Boolean

java.lang.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.

Since:

JDK1.0

See Also:

Serialized Form

Field Summary

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

Constructor Summary

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

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".

Method Summary

boolean	booleanValue() Returns the value of this Boolean object as a boolean.
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.
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".
int	hashCode() Returns a hash code for this Boolean.
String	toString() Returns a String object representing this Boolean's value.
static Boolean	valueOf(String s) Returns the boolean value represented by the specified String.

Methods inherited from class java.lang.Object

clone , finalize , getClass , notify , notifyAll , wait , wait , wait

Field Detail

TRUE

public static final Boolean TRUE

The Boolean object corresponding to the primitive value true.

FALSE

public static final Boolean FALSE

The Boolean object corresponding to the primitive value false.

TYPE

public static final Class TYPE

The Class object representing the primitive type boolean.

Since:

JDK1.1

Constructor Detail

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.

Method Detail

booleanValue

public boolean booleanValue()

Returns the value of this Boolean object as a boolean.

Returns:

the primitive boolean value of this object.

valueOf

public static 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.

toString

public 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

hashCode

public int hashCode()

Returns a hash code for this Boolean.

Returns:

a hash code value for this object.

Overrides:

hashCode in class Object

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

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.

See Also:

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