Here you can find the source of addAll(Collection
public static <T> void addAll(Collection<T> c, T[] a)
//package com.java2s; /*/* w w w. ja va 2 s . co m*/ * #! * Ontopia Engine * #- * Copyright (C) 2001 - 2013 The Ontopia Project * #- * 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 { /** * INTERNAL: Adds all elements in the array to the collection. */ public static <T> void addAll(Collection<T> c, T[] a) { for (int i = 0; i < a.length; i++) { c.add(a[i]); } } }