// interfaces/Games.java

// (c)2021 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

*/