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.ArrayList; import java.util.Collection; import java.util.List; public class Main { public static <T, V extends T> List<T> appendList(List<T> list, V o) { if (list == null) { list = new ArrayList<T>(); } list.add(o); return list; } public static <T, V extends T> List<T> appendList(List<T> list, int index, V o) { if (list == null) { list = new ArrayList<T>(1); } if (index > list.size()) { for (int i = list.size(); i < index; i++) { list.add(i, null); } } list.add(index, o); return list; } public static <T> int size(Collection<T> list) { if (list == null) { return 0; } return list.size(); } }