HashMap排序

已知HashMap<Integer,Proson> map,Proson类中有int age，String name属性。请根据Proson中的age进行降序排序。

public class TestMap {public static void main(String[] args) {TestMap t = new TestMap();HashMap hash = new HashMap<>();hash.put(1, new User(22, "张三"));hash.put(2, new User(19, "李四"));hash.put(3, new User(23, "王五"));hash.put(4, new User(18, "Tom"));HashMap ha = t.Test(hash);System.out.println("-----------"+ha);}private HashMap Test(HashMap hash){Set> en = hash.entrySet();List> list = new ArrayList<>(en);Collections.sort(list, new Comparator>() {@Overridepublic int compare(Entry o1, Entry o2) {return o1.getValue().getAge()-o2.getValue().getAge();//return o1.getKey()-o2.getKey();}});LinkedHashMap lm = new LinkedHashMap<>();for (Entry entry : list) {lm.put(entry.getKey(),entry.getValue());}return lm;}static class User{public User(int age, String name) {this.age = age;this.name = name;}int age;String name;public int getAge() {return age;}public void setAge(int age) {this.age = age;}public String getName() {return name;}public void setName(String name) {this.name = name;}}}