package innerclasses;

/**

* RUN:

* javac innerclasses/Games.java && java innerclasses.Games

* OUTPUT:

* Checkers move 0

* Checkers move 1

* Checkers move 2

* Chess move 0

* Chess move 1

* Chess move 2

* Chess move 3

*/

public class Games {

public static void playGame(GameFactory factory) {

Game g = factory.getGame();

while (g.move());

}

public static void main(String[] args) {

playGame(Checkers.factory);

playGame(Chess.factory);

}

}

interface Game {

boolean move();

}

interface GameFactory {

Game getGame();

}

class Checkers implements Game {

private Checkers() {}

private int moves = 0;

private static final int MOVES = 3;

public boolean move() {

System.out.println(getClass().getSimpleName() + " move " + moves);

return ++moves != MOVES;

}

public static GameFactory factory = new GameFactory() {

public Game getGame() {

return new Checkers();

}

};

}

class Chess implements Game {

private Chess() {}

private int moves = 0;

private static final int MOVES = 4;

public boolean move() {

System.out.println(getClass().getSimpleName() + " move " + moves);

return ++moves != MOVES;

}

public static GameFactory factory = new GameFactory() {

public Game getGame() {

return new Chess();

}

};

}