Super class code error..

Question

This is almost giving me an headache LOLOL gosh..
//Super class
public class X {
     private String pp = "xpto";
     public Y refy;
     public X(){}
     public X(String pp){
          this.pp = pp;
          refy = new Y();
     public String getPP(){ return pp; }
     public int p() {
          return Integer.parseInt(refy.testarString());
     public static void main(String[] xxx ){
          X x = new X();
          System.out.print(x.p());
// Extended class
public class Y extends X{
     private String ficheiro;
     public  Y() {}
     public Y(String pp, String ficheiro){
          super(pp);
          this.ficheiro = ficheiro;
     public String testarString() {
          String k = "2";
          return k;
I can't print that "2" inside the main method of the Super class, does anyone could tell me why ?
Message was edited by:
Java__Estudante

Answer 1

It would be helpful in the future if you could post the error you're getting (I'm assuming a NullPointerException)
Take a look at your two contructors:
> public X(){}
     public X(String pp){
          this.pp = pp;
          refy = new Y();
     }And then when you instantiate x, which one you call:
>           X x = new X();
          System.out.print(x.p());See what I'm getting at? Also, using a member variable in your superclass that is an instance of the subclass is a little strange--what is that trying to accomplish?