Java tutorial
//package com.java2s; /******************************************************************************* * Copyright (c) 2010 BSI Business Systems Integration AG. * All rights reserved. This program and the accompanying materials * are made available under the terms of the Eclipse Public License v1.0 * which accompanies this distribution, and is available at * http://www.eclipse.org/legal/epl-v10.html * * Contributors: * BSI Business Systems Integration AG - initial API and implementation ******************************************************************************/ import java.util.HashMap; import java.util.Map; public class Main { public static <T, U> Map<T, U> putAllObjects(Map<T, U> targetMap, Map<T, U> sourceMap) { if (targetMap == null && sourceMap == null) { return new HashMap<T, U>(); } if (targetMap == null) { return new HashMap<T, U>(sourceMap); } if (sourceMap == null) { return targetMap; // nothing to add } targetMap.putAll(sourceMap); return targetMap; } }