Here you can find the source of toArray(Collection
public static String[] toArray(Collection<String> values)
//package com.java2s; /*/*ww w .j av a2s . co m*/ * #%L * Tesora Inc. * Database Virtualization Engine * %% * Copyright (C) 2011 - 2014 Tesora Inc. * %% * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU Affero General Public License, version 3, * as published by the Free Software Foundation. * * This program 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 Affero General Public License for more details. * * You should have received a copy of the GNU Affero General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * #L% */ import java.util.Collection; public class Main { private static final String[] EMPTY_ARRAY = new String[] {}; public static String[] toArray(Collection<String> values) { return values.toArray(EMPTY_ARRAY); } }