Java tutorial
/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ /** * <p>Operations on boolean primitives and Boolean objects.</p> * * <p>This class tries to handle <code>null</code> input gracefully. * An exception will not be thrown for a <code>null</code> input. * Each method documents its behaviour in more detail.</p> * * @author Stephen Colebourne * @author Matthew Hawthorne * @author Gary Gregory * @since 2.0 * @version $Id: BooleanUtils.java 589050 2007-10-27 05:07:45Z bayard $ */ public class Main { /** * <p>Converts a Boolean to a boolean handling <code>null</code> * by returning <code>false</code>.</p> * * <pre> * BooleanUtils.toBoolean(Boolean.TRUE) = true * BooleanUtils.toBoolean(Boolean.FALSE) = false * BooleanUtils.toBoolean(null) = false * </pre> * * @param bool the boolean to convert * @return <code>true</code> or <code>false</code>, * <code>null</code> returns <code>false</code> */ public static boolean toBoolean(Boolean bool) { if (bool == null) { return false; } return bool.booleanValue() ? true : false; } }