Java tutorial
//package com.java2s; /* Copyright (C) 2013 TU Dortmund * This file is part of AutomataLib, http://www.automatalib.net/. * * AutomataLib is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License version 3.0 as published by the Free Software Foundation. * * AutomataLib is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with AutomataLib; if not, see * http://www.gnu.de/documents/lgpl.en.html. */ import java.util.List; public class Main { public static <E> E removeReplace(List<E> list, int index) { int lastIdx = list.size() - 1; E last = list.remove(lastIdx); if (lastIdx != index) { list.set(index, last); return last; } return null; } }