实体类

package com.whty.entity;public class User { private int id; private String name; private int age; public User(int id, String name, int age) { super(); this.id = id; this.name = name; this.age = age; } public int getId() { return id; } public void setId(int id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "User [id=" + id + ", name=" + name + ", age=" + age + "]"; }}

测试类

package com.whty.test;import java.util.ArrayList;import java.util.Collections;import java.util.Comparator;import java.util.List;import com.whty.entity.User;public class Test { public static void main(String[] args) { List<User> list = new ArrayList<>(); list.add(new User(1, "java", 20)); list.add(new User(2, "spark", 19)); list.add(new User(3, "hive", 21)); for(User user :list) { System.out.println("排序前：" + user.toString()); } //实现排序 Collections.sort(list, new Comparator<User>() { @Override public int compare(User u1, User u2) { if(u1.getAge() > u2.getAge()) { //return -1:即为正序排序 return -1; }else if (u1.getAge() == u2.getAge()) { return 0; }else { //return 1: 即为倒序排序 return 1; } } }); for(User user :list) { System.out.println("排序后：" + user.toString()); } }}

运行结果

排序前：User [id=1, name=java, age=20]
排序前：User [id=2, name=spark, age=19]
排序前：User [id=3, name=hive, age=21]
排序后：User [id=3, name=hive, age=21]
排序后：User [id=1, name=java, age=20]
排序后：User [id=2, name=spark, age=19]

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