抽象类如何返回子类对象的ArrayList？

import java.util.ArrayList;

abstract class AbstractClass {
    public abstract ArrayList<SubClass> getSubClasses();
}

class SubClass extends AbstractClass {
    @Override
    public ArrayList<SubClass> getSubClasses() {
        ArrayList<SubClass> subClasses = new ArrayList<>();
        // 添加子类对象到ArrayList中
        subClasses.add(new SubClass());
        return subClasses;
    }
}

public class Main {
    public static void main(String[] args) {
        AbstractClass abstractClass = new SubClass();
        ArrayList<SubClass> subClasses = abstractClass.getSubClasses();
        // 使用返回的子类对象的ArrayList
        for (SubClass subClass : subClasses) {
            // 处理子类对象
        }
    }
}