Java -实现compareTo() ArrayList自定义对象

import java.util.ArrayList;
import java.util.Collections;

class Person implements Comparable<Person> {
    private String name;
    private int age;

    public Person(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public String getName() {
        return name;
    }

    public int getAge() {
        return age;
    }

    @Override
    public int compareTo(Person other) {
        // 按照年龄进行比较
        return this.age - other.age;
    }
}

public class Main {
    public static void main(String[] args) {
        ArrayList<Person> personList = new ArrayList<>();
        personList.add(new Person("Alice", 25));
        personList.add(new Person("Bob", 30));
        personList.add(new Person("Charlie", 20));

        // 使用Collections.sort()方法对ArrayList进行排序
        Collections.sort(personList);

        // 输出排序结果
        for (Person person : personList) {
            System.out.println(person.getName() + " - " + person.getAge());
        }
    }
}