boolean.java

一个开源的JAVA虚拟机

/*
    libaegisvm - The Aegis Virtual Machine for executing Java bytecode
    Copyright (C) 2001-2002  Philip W. L. Fong

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*/

/*
 *  java.lang.Boolean
 *
 *  (c) 1997 George David Morrison
 *
 *  API version: 1.0.2
 *
 *  History:
 *  01JAN1997  George David Morrison
 *    Initial version
 */

package java.lang;

public final class Boolean implements java.io.Serializable {
    public static final Boolean TRUE = new Boolean(true);
    public static final Boolean FALSE = new Boolean(false);
    public static final Class TYPE = Class.getPrimitiveType(Class.T_BOOLEAN);

    private boolean value;

    public Boolean(boolean value) {
	this.value = value;
    }
    public Boolean(String s) {
	value = (s != null && s.equalsIgnoreCase("true"));
    }
    public boolean booleanValue() {
	return value;
    }
    public static Boolean valueOf(String s) {
	return new Boolean(s);
    }
    public String toString() {
	return value ? "true" : "false";
    }
    public int hashCode() {
	return value ? 1231 : 1237;
    }
    public boolean equals(Object obj) {
	return
	    obj instanceof Boolean &&
	    value == ((Boolean) obj).value;
    }
    public static boolean getBoolean(String name) {
	String propertyValue = System.getProperty(name);
	return valueOf(propertyValue).booleanValue();
    }
}