Sorts a Map by its values instead of by its keys - Java java.util

Java examples for java.util:Map Value

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Description

Sorts a Map by its values instead of by its keys

Demo Code


import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

public class Main {

  public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) {
    List<Map.Entry<K, V>> list = new LinkedList<Map.Entry<K, V>>(map.entrySet());
    Collections.sort(list, new Comparator<Map.Entry<K, V>>() {

      public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) {
        return (o1.getValue()).compareTo(o2.getValue());
      }/*from  w  ww .  j  ava 2s  . c o  m*/
    });

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

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