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//: polymorphism/Transmogrify.java

// Dynamically changing the behavior of an object

// via composition (the "State" design pattern).

import static net.mindview.util.Print.*;

class Actor {

public void act() {}

}

class HappyActor extends Actor {

public void act() { print("HappyActor"); }

}

class SadActor extends Actor {

public void act() { print("SadActor"); }

}

class Stage {

private Actor actor = new HappyActor();

public void change() { actor = new SadActor(); }

public void performPlay() { actor.act(); }

}

public class Transmogrify {

public static void main(String[] args) {

Stage stage = new Stage();

stage.performPlay();

stage.change();

stage.performPlay();

}

} /* Output:

HappyActor

SadActor

*///:~