Java -更改子类对象的属性

class Parent {
    protected int value;

    public Parent(int value) {
        this.value = value;
    }
}

class Child extends Parent {
    protected int value;

    public Child(int parentValue, int childValue) {
        super(parentValue); // 调用父类的构造函数初始化父类的属性
        this.value = childValue;
    }

    @Override
    public String toString() {
        return "Parent value: " + super.value + ", Child value: " + value;
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child(10, 20);
        System.out.println(child); // 输出：Parent value: 10, Child value: 20

        child.value = 30; // 修改子类的属性值
        System.out.println(child); // 输出：Parent value: 10, Child value: 30
    }
}