关于JAVA中成员变量的隐藏问题，请问如何解决？

Question

class A {
    int m;
    int getM(){
        return m;
    }
    int seeM(){
        return m;
    }
}
class B extends A{
    int m;
    int getM(){
        return m+100;
    }
}
public class exercise {
    public static void main(String[] args){
        B b = new B();
        b.m = 20;
        System.out.println(b.getM());
        A a = new A();
        a.m = -100;
        System.out.println(a.getM());
        System.out.println(b.seeM());
        System.out.println(b.getM());
        System.out.println(a.seeM());
    }
}

我的疑问是：
为什么上面中输出b.seeM()的值为0
不应该是seeM()继承下来，然后操作被隐藏的变量
也就是说我不明白为什么b.seeM()的值不为-100
不是java中子类继承的方法可以操作隐藏的成员变量吗？
多谢指点

Answer 1

删除类B中的成员变量m才能继承，修改后的代码如下：

class A {
    int m;
    int getM(){
        return m;
    }
    int seeM(){
        return m;
    }
}
class B extends A{
    int getM(){
        return m+100;
    }
}
public class exercise {
    public static void main(String[] args){
        B b = new B();
        b.m = 20;
        System.out.println(b.getM());
        A a = new A();
        a.m = -100;
        System.out.println(a.getM());
        System.out.println(b.seeM());
        System.out.println(b.getM());
        System.out.println(a.seeM());
    }
}