Magic Trick In Java

public class Ball {
    public static final String UNDER_HAT = "NONE";
}

public class HatOne {
    public boolean hasBall() {
        return "ONE".equals(Ball.UNDER_HAT);
    }
}

public class HatTwo {
    public boolean hasBall() {
        return "TWO".equals(Ball.UNDER_HAT);
    }
}

public class MagicTrick {
    public static void main(String... args) {
        HatOne hatOne = new HatOne();
        HatTwo hatTwo = new HatTwo();
        if (hatOne.hasBall() && hatTwo.hasBall())
            System.out.println("TADA!! The ball is under both hats!");
        else if (hatOne.hasBall())
            System.out.println("The ball is under hat one.");
        else if (hatTwo.hasBall())
            System.out.println("The ball is under hat two.");
        else
            System.out.println("Better luck next time.");
    }
}

public class Ball {
    public static String UNDER_HAT = "ONE";
    static {
        new Ball();
        System.gc();
        System.runFinalization();
    }
    protected void finalize() throws Throwable {
        UNDER_HAT = "TWO";
    }
}