Java tutorial
//package com.java2s; /* * Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com * The software in this package is published under the terms of the CPAL v1.0 * license, a copy of which has been included with this distribution in the * LICENSE.txt file. */ import java.util.LinkedList; import java.util.List; public class Main { /** * Some code uses null to indicate "unset", which makes appending items complex. */ public static List addCreate(List list, Object value) { if (null == list) { return singletonList(value); } else { list.add(value); return list; } } public static List singletonList(Object value) { List list = new LinkedList(); list.add(value); return list; } }