Here you can find the source of booleanValue(Object obj, boolean defaultValue)
public static boolean booleanValue(Object obj, boolean defaultValue)
//package com.java2s; /*//from ww w . j a v a 2s . co m * Copyright 2004-2012 the Seasar Foundation and the Others. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific language * governing permissions and limitations under the License. */ public class Main { public static boolean booleanValue(Object obj, boolean defaultValue) { if (obj != null) { if (obj instanceof Boolean) { return ((Boolean) obj).booleanValue(); } String stringValue = obj.toString().toLowerCase(); if (isTrueString(stringValue)) { return true; } else if (isFalseString(stringValue)) { return false; } } return defaultValue; } private static boolean isTrueString(String lowerCase) { return lowerCase.equals("true") || lowerCase.equals("yes") || lowerCase.equals("y") || lowerCase.equals("on") || lowerCase.equals("1"); } private static boolean isFalseString(String lowerCase) { return lowerCase.equals("false") || lowerCase.equals("no") || lowerCase.equals("n") || lowerCase.equals("off") || lowerCase.equals("0"); } }