java.lang

Class Boolean

Implemented Interfaces:
Comparable<T>, Serializable

public final class Boolean
extends Object
implements Serializable, Comparable<T>

Instances of class Boolean represent primitive boolean values.
Since:
1.0
See Also:
Serialized Form

Field Summary

static Boolean
FALSE
This field is a Boolean object representing the primitive value false.
static Boolean
TRUE
This field is a Boolean object representing the primitive value true.
static Class
TYPE
The primitive type boolean is represented by this Class object.

Constructor Summary

Boolean(boolean value)
Create a Boolean object representing the value of the argument value.
Boolean(String s)
Creates a Boolean object representing the primitive true if and only if s matches the string "true" ignoring case, otherwise the object will represent the primitive false.

Method Summary

boolean
booleanValue()
Return the primitive boolean value of this Boolean object.
int
compareTo(Boolean other)
Compares this Boolean to another.
boolean
equals(Object obj)
If the obj is an instance of Boolean and has the same primitive value as this object then true is returned.
static boolean
getBoolean(String name)
If the value of the system property name matches "true" ignoring case then the function returns true.
int
hashCode()
Returns the integer 1231 if this object represents the primitive true and the integer 1237 otherwise.
static boolean
parseBoolean(String b)
If the String argument is "true", ignoring case, return true.
String
toString()
Returns "true" if the value of this object is true and returns "false" if the value of this object is false.
static String
toString(boolean b)
Returns "true" if the value of the give boolean is true and returns "false" if the value of the given boolean is false.
static Boolean
valueOf(boolean b)
Returns the Boolean TRUE if the given boolean is true, otherwise it will return the Boolean FALSE.
static Boolean
valueOf(String s)
Returns the Boolean TRUE if and only if the given String is equal, ignoring case, to the the String "true", otherwise it will return the Boolean FALSE.

Methods inherited from class java.lang.Object

clone, equals, extends Object> getClass, finalize, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

FALSE

public static final Boolean FALSE
This field is a Boolean object representing the primitive value false. This instance is returned by the static valueOf() methods if they return a Boolean representing false.

TRUE

public static final Boolean TRUE
This field is a Boolean object representing the primitive value true. This instance is returned by the static valueOf() methods if they return a Boolean representing true.

TYPE

public static final Class TYPE
The primitive type boolean is represented by this Class object.
Since:
1.1

Constructor Details

Boolean

public Boolean(boolean value)
Create a Boolean object representing the value of the argument value. In general the use of the static method valueof(boolean) is more efficient since it will not create a new object.
Parameters:
value - the primitive value of this Boolean

Boolean

public Boolean(String s)
Creates a Boolean object representing the primitive true if and only if s matches the string "true" ignoring case, otherwise the object will represent the primitive false. In general the use of the static method valueof(String) is more efficient since it will not create a new object.
Parameters:
s - the String representation of true or false

Method Details

booleanValue

public boolean booleanValue()
Return the primitive boolean value of this Boolean object.
Returns:
true or false, depending on the value of this Boolean

compareTo

public int compareTo(Boolean other)
Compares this Boolean to another.
Parameters:
other - the Boolean to compare this Boolean to
Returns:
0 if both Booleans represent the same value, a positive number if this Boolean represents true and the other false, and a negative number otherwise.
Since:
1.5

equals

public boolean equals(Object obj)
If the obj is an instance of Boolean and has the same primitive value as this object then true is returned. In all other cases, including if the obj is null, false is returned.
Overrides:
equals in interface Object
Parameters:
obj - possibly an instance of any Class
Returns:
true if obj equals this

getBoolean

public static boolean getBoolean(String name)
If the value of the system property name matches "true" ignoring case then the function returns true.
Parameters:
name - the property name to look up
Returns:
true if the property resulted in "true"
Throws:
SecurityException - if accessing the system property is forbidden

hashCode

public int hashCode()
Returns the integer 1231 if this object represents the primitive true and the integer 1237 otherwise.
Overrides:
hashCode in interface Object
Returns:
the hash code

parseBoolean

public static boolean parseBoolean(String b)
If the String argument is "true", ignoring case, return true. Otherwise, return false.
Parameters:
b - String to parse
Since:
1.5

toString

public String toString()
Returns "true" if the value of this object is true and returns "false" if the value of this object is false.
Overrides:
toString in interface Object
Returns:
the string representation of this

toString

public static String toString(boolean b)
Returns "true" if the value of the give boolean is true and returns "false" if the value of the given boolean is false.
Parameters:
b - the boolean to convert
Returns:
the string representation of the boolean
Since:
1.4

valueOf

public static Boolean valueOf(boolean b)
Returns the Boolean TRUE if the given boolean is true, otherwise it will return the Boolean FALSE.
Parameters:
b - the boolean to wrap
Returns:
the wrapper object
Since:
1.4
See Also:
TRUE, FALSE

valueOf

public static Boolean valueOf(String s)
Returns the Boolean TRUE if and only if the given String is equal, ignoring case, to the the String "true", otherwise it will return the Boolean FALSE.
Parameters:
s - the string to convert
Returns:
a wrapped boolean from the string

Boolean.java -- object wrapper for boolean Copyright (C) 1998, 2001, 2002, 2004, 2005 Free Software Foundation, Inc. This file is part of GNU Classpath. GNU Classpath is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2, or (at your option) any later version. GNU Classpath is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GNU Classpath; see the file COPYING. If not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. Linking this library statically or dynamically with other modules is making a combined work based on this library. Thus, the terms and conditions of the GNU General Public License cover the whole combination. As a special exception, the copyright holders of this library give you permission to link this library with independent modules to produce an executable, regardless of the license terms of these independent modules, and to copy and distribute the resulting executable under terms of your choice, provided that you also meet, for each linked independent module, the terms and conditions of the license of that module. An independent module is a module which is not derived from or based on this library. If you modify this library, you may extend this exception to your version of the library, but you are not obligated to do so. If you do not wish to do so, delete this exception statement from your version.