Thread: Access and set variable in parent class through child

Hi,

I have 3 classes, A, B, and C.

B extends A, and C extends B. Each class has a protected variable named x. Class A has a method to set x, and one to retrieve x, which I understand are inherited by both B and C.

What I'm trying to do is also have a method in C that can access and set the x in A. So far, everything I've tried will only make changes to the x in C.

class A {
protected int x = 0;

A() {x = 0;}

void setX(int value) {x = value;}
void getX() {System.out.println(x);}
}

class B extends A {
protected int x = 0;

B() {x = 0;}
}

class C extends B {
protected int x = 0;

C() {x = 0;}

void setAfromC(int value) {} // I imagine this is what I'm missing??
void getAfromC() {}
}

public class Test {
public static void main( String[] args ) {
A a = new A();
B b = new B();
C c = new C();

a.setX(1);
b.setX(2);
c.setX(3);

a.getX();
b.getX();
c.getX();

c.setAfromC(2);
c.getAfromC(); //This should output 2,
c.getX(); //while this should still output 3!
}
}

I've tried using "super.", but I learned that it only lets me use A's methods to apply them to C's variables.

I would really appreciate a hint as to how to do this!

Originally Posted by newbie

Sorry if I haven't understood what you wanted, but does..

    void setAfromC(int value) {
        setX(value);
    } // I imagine this is what I'm missing??
    void getAfromC() {
        getX();
    }

..do what you needed?

(Just a shot in the dark sorry )

Thanks for trying to help out!

The problem is that I'm trying to change the x in A through a method in C. Doing what you suggested only changes the x in C, which I'm actually trying to leave unchanged!

Answered Here. Please read this for why cross-posting like this is frowned upon