Here you can find the source of addElements(boolean removeDuplicates, final List
private static <E> void addElements(boolean removeDuplicates, final List<E> result, Collection<? extends E> elements)
//package com.java2s; /**/*ww w . jav a2 s . com*/ * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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; import java.util.List; public class Main { private static <E> void addElements(boolean removeDuplicates, final List<E> result, Collection<? extends E> elements) { for (E item : elements) { if (removeDuplicates) { if (!result.contains(item)) { result.add(item); } } else { result.add(item); } } } }