java - 是否可以更改java中继承类的 protected 变量？

Question

例如:

class A {
    protected Integer x;

    class A () {
       x = new Integer(0);
    }

    public setX(Integer m) {
       x = m;
    }
}

class B extends A {

    public class B () {
       super();
    }

    public static void main () {
       B b = new B();
       b.setX(69);
       System.out.println("Value of x is: " + b.x);  // expect to be 69. Is it correct?      
    }
}

Answer 1

是的，这就是 protected 的目的:)