面向对象分析与设计示例：骰子游戏

class Die {
    int faceValue;

    public Die() {
        faceValue = 0;
    }

    public int getFaceValue() {
        return faceValue;
    }

    public void roll() {
        faceValue = (int) (1 + Math.random() * 7);
    }
}

class MyDiceGame {
    Die die1, die2;

    public MyDiceGame() {
        die1 = new Die();
        die2 = new Die();
    }

    public Boolean play() {
        die1.roll();
        int fv1 = die1.getFaceValue();
        die2.roll();
        int fv2 = die2.getFaceValue();
        return fv1 + fv2 == 7;
    }

    public int getFaceValue1() {
        return die1.getFaceValue();
    }

    public int getFaceValue2() {
        return die2.getFaceValue();
    }
}

public class Player {

    public static void main(String[] args) {
        MyDiceGame game = new MyDiceGame();
        if (game.play()) {
            System.out.println("Win " + game.getFaceValue1() + " " + game.getFaceValue2());
        } else {
            System.out.println("Lose " + game.getFaceValue1() + " " + game.getFaceValue2());
        }
    }

}