實體類

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 + "]";
	}
}

測試類

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());
		}
		//實現排序
		Collections.sort(list,new Comparator<User>() {
			@Override
			public int compare(User u1,User u2) {
				if(u1.getAge() > u2.getAge()) {
					//return -1:即為正序排序
					return -1;
				}else if (u1.getAge() == u2.getAge()) {
					return 0;
				}else {
					//return 1: 即為倒序排序
					return 1;
				}
			}
		});
		
		for(User user :list) {
			System.out.println("排序後：" + user.toString());
		}
	}
}

執行結果

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]
排序後：User [id=3,age=21]
排序後：User [id=1,age=20]
排序後：User [id=2,age=19]

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