Inheritance 9: Final

/**
 *  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{
  //cannot redeclare these methods with 
  //same name and argument types.
  public static final void f(){
    System.out.println("Superclass f");
  }
  public  final void g(){
    System.out.println("Superclass g");
  }
}

class Subclass extends Superclass{
/*Cannot declare any of these to try would be an error

  public static void f(){
    System.out.println("Subclass f");
  }

  public void g(){
    System.out.println("Subclass g");
  }

  public int f(){
    System.out.println("Subclass f");
    return 1;
  }
*/

  //These overloaded methods are OK
  public void f(int x){
    System.out.println("Subclass f");
  }

  public int f(double x){
    System.out.println("Subclass f");
    return 1;
  }
}

class l1Inherit9{//Final1
  public static void main(String[] args){
    Subclass sub = new Subclass();
    sub.f();
    sub.g();
    sub.f(1);
    sub.f(1.1);
  }
}
/******** sample compilation & run *******
# javac l1Inherit9.java 
# java l1Inherit9
Superclass f
Superclass g
Subclass f
Subclass f
# 
******************************************/