如何获取继承类的int成员？

class Parent {
    protected int value = 10;
}

class Child extends Parent {
    void printValue() {
        System.out.println(value); // 直接访问继承的int成员
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child();
        child.printValue(); // 输出: 10
    }
}

class Parent {
    private int value = 10;

    protected int getValue() {
        return value;
    }
}

class Child extends Parent {
    void printValue() {
        System.out.println(getValue()); // 通过getter方法访问
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child();
        child.printValue(); // 输出: 10
    }
}

class GrandParent {
    protected int value = 10;
}

class Parent extends GrandParent {
    // Parent类没有额外的int成员
}

class Child extends Parent {
    void printValue() {
        if (this instanceof GrandParent) {
            GrandParent grandParent = (GrandParent) this;
            System.out.println(grandParent.value); // 类型转换后访问
        }
    }
}

public class Main {
    public static void main(String[] args) {
        Child child = new Child();
        child.printValue(); // 输出: 10
    }
}

if (child instanceof GrandParent) {
    GrandParent grandParent = (GrandParent) child;
    // 安全地进行操作
}