Here you can find the source of toStringArray(List
public static String[] toStringArray(List<String> items)
//package com.java2s; /*/*from w w w . j ava 2 s . c o m*/ Part of the NETLab Hub, which is part of the NETLab Toolkit project - http://netlabtoolkit.org Copyright (c) 2006-2013 Ewan Branda NETLab Hub is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. NETLab Hub 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 General Public License for more details. You should have received a copy of the GNU General Public License along with NETLab Hub. If not, see <http://www.gnu.org/licenses/>. */ import java.util.List; public class Main { public static String[] toStringArray(List<String> items) { if (items == null) return new String[] {}; String[] arr = new String[items.size()]; for (int i = 0; i < items.size(); i++) { arr[i] = items.get(i); } return arr; } }