java.lang
Class Boolean

java.lang.Object
  |
  +--java.lang.Boolean

All Implemented Interfaces:

Serializable

public final class Boolean

extends Object

implements Serializable

Safe:

See Also:

Serialized Form

Field Summary

static Boolean	FALSE Enabled: The Boolean object corresponding to the primitive value false.
private static long	serialVersionUID use serialVersionUID from JDK 1.0.2 for interoperability
static Boolean	TRUE Enabled: The Boolean object corresponding to the primitive value true.
static Class	TYPE Enabled: The Class object representing the primitive type boolean.
private boolean	value The value of the Boolean.

Constructor Summary

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

Boolean(String s)
Enabled: 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	and(boolean arg) Added:
boolean	booleanValue() Enabled: Returns the value of this Boolean object as a boolean primitive.
boolean	equals(Object obj) Suppressed: 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) Suppressed: Returns true if and only if the system property named by the argument exists and is equal to the string "true".
int	hashCode() Suppressed: Returns a hash code for this Boolean object.
boolean	not() Added:
boolean	or(boolean arg) Added:
Object	pick(Object trueChoice, Object falseChoice) Added:
private static boolean	toBoolean(String name)
String	toString() Suppressed: Returns a String object representing this Boolean's value.
static String	toString(boolean b) Suppressed: Returns a String object representing the specified boolean.
static Boolean	valueOf(boolean b) Suppressed: Returns a Boolean instance representing the specified boolean value.
static Boolean	valueOf(String s) Enabled: Returns a Boolean with a value represented by the specified String.
boolean	xor(boolean arg) Added:

Methods inherited from class java.lang.Object

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

Field Detail

TRUE

public static final Boolean TRUE

Enabled: The Boolean object corresponding to the primitive value true.

FALSE

public static final Boolean FALSE

Enabled: The Boolean object corresponding to the primitive value false.

TYPE

public static final Class TYPE

Enabled: The Class object representing the primitive type boolean.

Since:

JDK1.1

value

private boolean value

The value of the Boolean.

serialVersionUID

private static final long serialVersionUID

use serialVersionUID from JDK 1.0.2 for interoperability

Constructor Detail

Boolean

public Boolean(boolean value)

Enabled: Allocates a Boolean object representing the value argument.

Note: It is rarely appropriate to use this constructor. Unless a new instance is required, the static factory valueOf(boolean) is generally a better choice. It is likely to yield significantly better space and time performance.

Parameters:

value - the value of the Boolean.

Boolean

public Boolean(String s)

Enabled: 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. Examples:

new Boolean("True") produces a Boolean object that represents true.
new Boolean("yes") produces a Boolean object that represents false.

Parameters:

s - the string to be converted to a Boolean.

Method Detail

booleanValue

public boolean booleanValue()

Enabled: 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)

Suppressed: 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 to yield significantly better space and time performance.

Parameters:

b - a boolean value.

Returns:

a Boolean instance representing b.

Since:

1.4

valueOf

public static Boolean valueOf(String s)

Enabled: Returns a Boolean with a value represented by the specified String. The Boolean returned represents the value true if the string argument is not null and is equal, ignoring case, to the string "true".

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

Parameters:

s - a string.

Returns:

the Boolean value represented by the string.

toString

public static String toString(boolean b)

Suppressed: 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

public String toString()

Suppressed: 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()

Suppressed: 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:

java.lang.Object#equals(java.lang.Object), java.util.Hashtable

equals

public boolean equals(Object obj)

Suppressed: 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(), java.util.Hashtable

getBoolean

public static boolean getBoolean(String name)

Suppressed: Returns true if and only if the system property named by the argument exists and is equal to the string "true". (Beginning with version 1.0.2 of the Java^TM platform, the test of this string is case insensitive.) 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.

See Also:

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

toBoolean

private static boolean toBoolean(String name)

and

public boolean and(boolean arg)

Added:

or

public boolean or(boolean arg)

Added:

xor

public boolean xor(boolean arg)

Added:

not

public boolean not()

Added:

pick

public Object pick(Object trueChoice,
                   Object falseChoice)

Added: