Android List Duplicate Remove removeDuplicates(List list, Comparator comparator)

Description

Sorts and removes duplicate elements from list .

License

Apache License

Declaration

public static <T> void removeDuplicates(List<T> list,
        Comparator<? super T> comparator) 

Method Source Code

//package com.java2s;
/*// w ww  . 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();
        }
    }
}

Related

1. removeDuplicates(List list)