（key，value）对value进行排序

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降序排序

package test;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.HashMap;import java.util.List;import java.util.Map;import java.util.Map.Entry;public class mapSort {    /**     * @param args     */    public static void main(String[] args) {        // TODO Auto-generated method stub        Map<String,String> map = new HashMap<String,String>();//        map.put("c","cccc");//        map.put("a","aaaa");//        map.put("b","bbbb");//        map.put("d","dddd");        map.put("c","0.6");        map.put("a","0.78");        map.put("b","0.5");        map.put("d","0.78");        List<Map.Entry<String,String>> list=new ArrayList<Map.Entry<String,String>>(map.entrySet());        Collections.sort(list,new Comparator<Map.Entry<String,String>>(){            public int compare(Entry<String,String> o1,Entry<String,String> o2){                return o2.getValue().compareTo(o1.getValue());            }        }        );//        for(Map.Entry<String, String> mapping:list){//          System.out.println(mapping.getKey()+":"+mapping.getValue());//        }       // for(int i = 0;i<1;i++)        for(int i = 0;i<list.size();i++)        {            System.out.println("key:" + list.get(i).getKey() + "---Value:" + list.get(i).getValue() );              }    }}

运行结果
这里写图片描述
升序排序，只需改一行

public int compare(Entry<String,String> o1,Entry<String,String> o2){                return o1.getValue().compareTo(o2.getValue());            }

运行结果
这里写图片描述

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