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Java如何实现List自定义排序

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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 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() {

@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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