Here you can find the source of valueOf(Boolean bool)
public static boolean valueOf(Boolean bool)
//package com.java2s; /******************************************************************************* * Copyright (c) 2010 Robert "Unlogic" Olofsson (unlogic@unlogic.se). * All rights reserved. This program and the accompanying materials * are made available under the terms of the GNU Lesser Public License v3 * which accompanies this distribution, and is available at * http://www.gnu.org/licenses/lgpl-3.0-standalone.html ******************************************************************************/ public class Main { public static boolean valueOf(Boolean bool) { if (bool == null) { return false; } else {//from w ww.java 2 s .co m return bool; } } }