Java tutorial
//package com.java2s; /* Copyright 2011-2014 Red Hat, Inc This file is part of PressGang CCMS. PressGang CCMS is free software: you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. PressGang CCMS 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 PressGang CCMS. If not, see <http://www.gnu.org/licenses/>. */ import java.util.ArrayList; import java.util.Collection; import java.util.List; public class Main { public static List<Integer> toAbsIntegerList(final Collection<Integer> array) { final ArrayList<Integer> retValue = new ArrayList<Integer>(); for (final Integer item : array) retValue.add(Math.abs(item)); return retValue; } }