/**
  * @author  monika heiner
  * @version 1.0
  * @date 04.04.2002
  * @package informatik2.hello
  * @class Hello7
  */
 
// avoiding of code duplication by just noting the add-on's,
// -> inheritance, OO basic principle:
// the heir inherits all features of all ancestors;
// inherited functionality may be changed -> polymorphy;

public class Hello7 {

	public static void main (String[] argv) {
		Mouth mouth = new Mouth("Hello, World!");
		mouth.say();
		mouth.open("Hello, Europe!"); mouth.say();
		
		CountingMouth mund = new CountingMouth();
		mund.open("Hallo, Welt!"); mund.say(); 
		mund.open("Hallo, Europa!"); mund.say();	
	} // main

} // Hello7

//--------------------- cut into separate files -----------------------------

class Mouth {

	public Mouth () {
		what = null;
	} // Mouth

	public Mouth (String thought) {
		what = thought;
	} // Mouth
	
	public void say() {
		System.out.println(what); 	 
	} // say
	
	public void open (String thought) {
		what = thought;
	} // open
	
	private String what;
	
} // Mouth

//--------------------- cut into separate files -----------------------------

class CountingMouth extends Mouth {

	public CountingMouth () {
		super();
		count = 0;
	} // CountingMouth

	public CountingMouth (String thought) {
		super(thought);
		count = 0;
	} // CountingMouth
	
	public void say() {
		count++;
		System.out.print("(" + count + ") "); 
		super.say();	 
	} // say
	
	private int count;
	
} // CountingMouth