Java example for inheritance with protected data member

class Papa{
    protected int x;
    Papa(){ x=40;}
    Papa(int y){x=y;}
}
public class son extends Papa
{
    protected int x=0;
    son(){super(15);}
    son(int x){ }
         public static void main(String []args)
         {
                son s = new son();
                System.out.println(s.x+" ");
                Papa t =new son(2);
                System.out.println(t.x);
     }
}