Here you can find the source of contains(Collection objects, Object o)
public static boolean contains(Collection objects, Object o)
//package com.java2s; /*/*from www . j av a 2 s . c om*/ * WANDORA * Knowledge Extraction, Management, and Publishing Application * http://wandora.org * * Copyright (C) 2004-2016 Wandora Team * * This program 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. * * 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. * * * * * GenericVelocityHelper.java * * Created on 17. joulukuuta 2004, 10:54 */ import java.util.*; public class Main { public static boolean contains(Collection objects, Object o) { if (objects == null || o == null) return false; else return objects.contains(o); } }