在Java语言中按子类对ArrayList进行排序

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

public class Main {
    public static void main(String[] args) {
        // 创建一个ArrayList对象
        ArrayList<Subclass> list = new ArrayList<>();

        // 添加元素到ArrayList
        list.add(new Subclass("C"));
        list.add(new Subclass("A"));
        list.add(new Subclass("B"));

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

        // 打印排序后的结果
        for (Subclass item : list) {
            System.out.println(item.getName());
        }
    }
}

// 子类必须实现Comparable接口
class Subclass implements Comparable<Subclass> {
    private String name;

    public Subclass(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    // 重写compareTo()方法来定义排序规则
    @Override
    public int compareTo(Subclass other) {
        return this.name.compareTo(other.getName());
    }
}

A
B
C