Here you can find the source of sortByValue(Map
public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map)
//package com.java2s; //License from project: Open Source License import java.util.*; public class Main { public static <K, V extends Comparable<? super V>> Map<K, V> sortByValue(Map<K, V> map) { return sort(map, new Comparator<Map.Entry<K, V>>() { public int compare(Map.Entry<K, V> o1, Map.Entry<K, V> o2) { return (o2.getValue()).compareTo(o1.getValue()); }/*from w w w. j av a 2 s . c o m*/ }); } public static <K, V> Map<K, V> sort(Map<K, V> map, Comparator<Map.Entry<K, V>> comparator) { List<Map.Entry<K, V>> list = new LinkedList<Map.Entry<K, V>>(map.entrySet()); Collections.sort(list, comparator); Map<K, V> result = new LinkedHashMap<K, V>(); for (Map.Entry<K, V> entry : list) { result.put(entry.getKey(), entry.getValue()); } return result; } }