// interfaces/Games.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// A Game framework using Factory Methods

interface Game { boolean move(); }
interface GameFactory { Game getGame(); }

class Checkers implements Game {
 private int moves = 0;
 private static final int MOVES = 3;
 @Override
 public boolean move() {
 System.out.println("Checkers move " + moves);
 return ++moves != MOVES;
 }
}

class CheckersFactory implements GameFactory {
 @Override
 public Game getGame() { return new Checkers(); }
}

class Chess implements Game {
 private int moves = 0;
 private static final int MOVES = 4;
 @Override
 public boolean move() {
 System.out.println("Chess move " + moves);
 return ++moves != MOVES;
 }
}

class ChessFactory implements GameFactory {
 @Override
 public Game getGame() { return new Chess(); }
}

public class Games {
 public static void playGame(GameFactory factory) {
 Game s = factory.getGame();
 while(s.move())
 ;
 }
 public static void main(String[] args) {
 playGame(new CheckersFactory());
 playGame(new ChessFactory());
 }
}
/* Output:
Checkers move 0
Checkers move 1
Checkers move 2
Chess move 0
Chess move 1
Chess move 2
Chess move 3
*/