/**
  * @author  mh, inspired by Mark Lutton, Brookline, NH
  * @version 1.0
  * @date 13.01.2003
  * @package informatik2.hello
  * @class Hello8
  */

// interface realization by an abstract class 
// consisting only of abstract methods

public class Hello8 {

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

} // Hello6

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

abstract class Mouth {

	abstract void say();
	abstract void open(String thought);

} // Mouth

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

class SimpleMouth extends Mouth {

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

	private String what;
	
} // SimpleMouth

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

class CountingMouth extends Mouth {

	public CountingMouth () {
		what = null;
		count = 0;
	} // CountingMouth
	
	public CountingMouth (String thought) {
		what = thought;
		count = 0;
	} // CountingMouth
	
	public void say() {
		count++;
		System.out.println("(" + count + ") " + what); 	 
	} // say
	
	public void open (String thought) {
		what = thought;
	} // open
	
	private String what;
	private int count;
	
} // CountingMouth