/**
  * @author  mh, inspired by Mark Lutton, Brookline, NH
  * @version 1.0
  * @date 04.04.2002, updated 13.01.2003
  * @package informatik2.hello
  * @class Hello5
  */

// programming to an interface, not an implementation,
// -> ADT basic principle -> Design Patterns:
// interfaces serve as contract,
// implementations may be exchanged, if required;
// different implementations may even be used concurrently;

public class Hello5 {

	public static void main (String[] argv) {
		Mouth mouth = new SimpleMouth("Hello, World!");
		mouth.say();
		Mouth mund = new CountingMouth("Hallo, Welt!");
		mund.say(); mouth.say();
		mund.say(); mouth.say();
		
		// assignment of different implementations
		System.out.println("-----------------");
		mouth = mund; mouth.say(); mund.say();		
	} // main

} // Hello5

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

interface Mouth {

	public void say();

} // Mouth

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

class SimpleMouth implements Mouth {

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

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

class CountingMouth implements Mouth {

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