Java Map Sort sortByValue(Map map)

Description

Sort a map by value (increasing order)

License

Open Source License

Parameter

Parameter	Description
K	a parameter
V	a parameter
map	a parameter

Declaration

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

Method Source Code

//package com.java2s;
/*/*from   w w  w.  j  a  va2 s  .  co m*/
 *  Copyright or ? or Copr. Ecole des Mines d'Al?s (2012-2014) 
 *  
 *  This software is a computer program whose purpose is to provide 
 *  several functionalities for the processing of semantic data 
 *  sources such as ontologies or text corpora.
 *  
 *  This software is governed by the CeCILL  license under French law and
 *  abiding by the rules of distribution of free software.  You can  use, 
 *  modify and/ or redistribute the software under the terms of the CeCILL
 *  license as circulated by CEA, CNRS and INRIA at the following URL
 *  "http://www.cecill.info". 
 * 
 *  As a counterpart to the access to the source code and  rights to copy,
 *  modify and redistribute granted by the license, users are provided only
 *  with a limited warranty  and the software's author,  the holder of the
 *  economic rights,  and the successive licensors  have only  limited
 *  liability. 
    
 *  In this respect, the user's attention is drawn to the risks associated
 *  with loading,  using,  modifying and/or developing or reproducing the
 *  software by the user in light of its specific status of free software,
 *  that may mean  that it is complicated to manipulate,  and  that  also
 *  therefore means  that it is reserved for developers  and  experienced
 *  professionals having in-depth computer knowledge. Users are therefore
 *  encouraged to load and test the software's suitability as regards their
 *  requirements in conditions enabling the security of their systems and/or 
 *  data to be ensured and,  more generally, to use and operate it in the 
 *  same conditions as regards security. 
 * 
 *  The fact that you are presently reading this means that you have had
 *  knowledge of the CeCILL license and that you accept its terms.
 */

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 {
    /**
     * Sort a map by value (increasing order)
     *
     * @param <K>
     * @param <V>
     * @param map
     * @return
     */
    public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {

        return sortByValue(map, new Comparator<Entry<K, V>>() {

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

    }

    /**
     * Sort a map by value (increasing order)
     *
     * @param <K>
     * @param <V>
     * @param map
     * @param comparator
     * @return
     */
    public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map,
            Comparator<Entry<K, V>> comparator) {

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

        Collections.sort(list, comparator);

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

Related

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