Question

如何从另一个类访问变量的最后一个值？程序运行30秒，结束30秒，它打印变量。

游戏类：

public class Game {
    public int true_num = 0, false_num = 0;

    public Game() throws InterruptedException, IOException {
        new TimerDemo(30);
        while (true) {
            play(); // true_num/false_num are changed in this method.
        }

    }
}

TimerDemo类：

public class TimerDemo {
        Toolkit toolkit;

    Timer timer;

    public TimerDemo(int seconds) {
        toolkit = Toolkit.getDefaultToolkit();
        timer = new Timer();
        timer.schedule(new RemindTask(), seconds * 1000);
    }

    class RemindTask extends TimerTask {

        @Override
        public void run() {
            System.out.println("Time's up!");

            JLabel lb = new JLabel("true_num = " + true_num
                    + " and " + "false_num = " + false_num);
            lb.setFont(new Font("Arial", Font.BOLD, 18));
            UIManager.put("OptionPane.minimumSize", new Dimension(150, 90));
            JOptionPane.showMessageDialog(null, lb, "aaa", 1);

            toolkit.beep();
            System.exit(0);
        }
    }
}

如何在Game类的play函数中访问变量的最后一个值？调用类导致play function再次运行，不应该。

Answer 1

没有Game的参考，我在游戏中添加了Game.total并定义了volatile总数。

在TimerDemo中：

public void run() {
     System.out.println("Time's up! Total = " + Game.total + "true_num =" + Game.true_num + "false_num =" + Game.false_num);
}

在游戏中：

public static volatile int true_num = 0, false_num = 0, total = 0;

如何在课程结束时获取最后一个变量值？

1 个答案: