HashMap排序

import java.util.*;
public class Test {

    public static void main(String[] args) {
        Map<Integer,String> map1=new HashMap();
        Map<String,Integer> map2=new HashMap();

        map1.put(2,"张三");
        map1.put(1,"李四");
        map1.put(3,"王二");

        map2.put("张三",2);
        map2.put("李四",3);
        map2.put("王二",1);

        sortByKey(map1);
        sortByValue(map2);

    }
    public static void sortByKey(Map<Integer,String> map){
        List<Map.Entry<Integer,String>> list=new ArrayList<Map.Entry<Integer,String>>(map.entrySet());
        Collections.sort(list, new Comparator<Map.Entry<Integer,String>>() {
            @Override
            public int compare(Map.Entry<Integer,String> o1, Map.Entry<Integer,String> o2) {
                return o1.getValue().compareTo(o2.getValue());
            }
        });

        for(Map.Entry entry :  list){
            System.out.println("key:"+entry.getKey() + "value:"+entry.getValue());
        }
    }

    public static void sortByValue(Map<String,Integer> map){
        List<Map.Entry<String,Integer>> list=new ArrayList<Map.Entry<String, Integer>>(map.entrySet());
        Collections.sort(list, new Comparator<Map.Entry<String, Integer>>() {
            @Override
            public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
                return o1.getValue().compareTo(o2.getValue());
            }
        });

        for(Map.Entry entry :  list){
            System.out.println("key:"+entry.getKey() + "value:"+entry.getValue());
        }
    }

}