Here you can find the source of sort( Collection
public static <T> List<Entry<T, Integer>> sort( Collection<Entry<T, Integer>> entrySet)
//package com.java2s; /**// w w w . j ava 2 s . co m * Copyright (C) 2010 Peter Karich <jetwick_@_pannous_._info> * * 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.ArrayList; import java.util.Collection; import java.util.Collections; import java.util.Comparator; import java.util.List; import java.util.Map.Entry; public class Main { /** * @return a sorted list where the object with the highest integer value comes first! */ public static <T> List<Entry<T, Integer>> sort( Collection<Entry<T, Integer>> entrySet) { List<Entry<T, Integer>> sorted = new ArrayList<Entry<T, Integer>>( entrySet); Collections.sort(sorted, new Comparator<Entry<T, Integer>>() { @Override public int compare(Entry<T, Integer> o1, Entry<T, Integer> o2) { int i1 = o1.getValue(); int i2 = o2.getValue(); if (i1 < i2) return 1; else if (i1 > i2) return -1; else return 0; } }); return sorted; } }