Java Map Sort sortByValue(Map map)

Description

sort By Value

License

Open Source License

Declaration

public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) 

Method Source Code

//package com.java2s;
/* *********************************************************************** *
 * project: org.matsim.*/*from   w  w  w.  ja v  a 2  s .c  om*/
 * CollectionUtils.java
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 * copyright       : (C) 2011 by the members listed in the COPYING,        *
 *                   LICENSE and WARRANTY file.                            *
 * email           : info at matsim dot org                                *
 *                                                                         *
 * *********************************************************************** *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *   See also COPYING, LICENSE and WARRANTY file                           *
 *                                                                         *
 * *********************************************************************** */

import java.util.Collections;
import java.util.Comparator;

import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;

public class Main {
    public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
        return sortByValue(map, false);
    }

    public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map, boolean decesnding) {
        int s2 = 1;
        if (decesnding)
            s2 = -1;
        final int sign = s2;

        List<Map.Entry<K, V>> list = new LinkedList<>(map.entrySet());

        Collections.sort(list, new Comparator<Map.Entry<K, V>>() {

            @Override
            public int compare(Entry<K, V> o1, Entry<K, V> o2) {
                return sign * o1.getValue().compareTo(o2.getValue());
            }
        });

        Map<K, V> sorted = new LinkedHashMap<>();
        for (Map.Entry<K, V> entry : list) {
            sorted.put(entry.getKey(), entry.getValue());
        }

        return sorted;
    }
}

Related

1. sortByValue(Map map)
2. sortByValue(Map map, Comparator aComp)
3. sortByValue(Map map)
4. sortByValue(Map map)
5. sortByValue(Map map)
6. sortByValue(Map map)
7. sortByValue(Map map)
8. sortByValue(Map map)
9. sortByValue(Map map, boolean descending)