Here you can find the source of removeDuplicates(List
public static <T> void removeDuplicates(List<T> list, Comparator<? super T> comparator)
//package com.java2s; /*/* ww w . j a v a 2 s. c o m*/ * Copyright (C) 2010 The Android Open Source 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.Collections; import java.util.Comparator; import java.util.List; public class Main { /** * Sorts and removes duplicate elements from {@code list}. This method does * not use {@link Object#equals}: only the comparator defines equality. */ public static <T> void removeDuplicates(List<T> list, Comparator<? super T> comparator) { Collections.sort(list, comparator); int j = 1; for (int i = 1; i < list.size(); i++) { if (comparator.compare(list.get(j - 1), list.get(i)) != 0) { T object = list.get(i); list.set(j++, object); } } if (j < list.size()) { list.subList(j, list.size()).clear(); } } }