Inheritance 4: Protected

/**
 *  This code is from the book:
 *  Winder, R and Roberts, G (1998)
 *  Developing Java Software</em>
 *  John Wiley & Sons.
 *  It is copyright (c) 1997 Russel Winder
 *  and Graham Roberts.
 */

class Superclass{
  public void f(int x){
    System.out.println("Superclass int" + x);
  }
}

class Subclass extends Superclass{
  public void h(int x, double y, double z){
    System.out.println("Subclass int int double ");
  }

  public void h(double x, double y, double z) {}

  public void g(int x, double y) {}
  public void g(double x, int y) {}

  public void f(double d){
    System.out.println("Subclass double " + d);
  }

  public void f(String s){
    System.out.println("Subclass: " + s);
  }

  public void k(int x){
    f(1.0);
  }

  public static void k(double x) {}
}

public class l1Inherit4{//Inherit3
  public static void main(String[] args){
    Superclass superclass = new Superclass();
    superclass.f(10);
    Subclass subclass = new Subclass();
    //subclass.f(10);
    subclass.f(1.1);
    subclass.k(1.0);
    subclass.g(1.0,1);
    //subclass.g(1,1);
    subclass.g(1,1.0);
    subclass.h(1,1,1);
    superclass = subclass;
    // superclass.f(10.1);
  }
}
/******** sample compilation & run ********
# javac l1Inherit4.java 
# java l1Inherit4      
Superclass int10
Subclass double 1.1
Subclass int int double 
# 
******************************************/