Here you can find the source of addAll(Collection
public static <T> void addAll(Collection<T> collection, T[] items)
//package com.java2s; /*/*from w w w . ja va2 s .c o m*/ * Copyright 2009 ETH Zuerich, CISD * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import java.util.Collection; public class Main { /** Adds specified items to the specified collection. */ public static <T> void addAll(Collection<T> collection, T[] items) { for (T newElem : items) { collection.add(newElem); } } }