如何在Swing中创建延迟 [英] How to create a delay in Swing

问题描述

我制作了一个二十一点游戏，我希望AI玩家在拍卡之间暂停一下。我尝试过简单地使用Thread.sleep（x），但这会让它冻结，直到AI玩家完成所有的牌。我知道Swing不是线程安全的，所以我看了Timers，但我无法理解如何使用它。这是我目前的代码：

I made a blackjack game, and I want the AI player to pause between taking cards. I tried simply using Thread.sleep(x), but that makes it freeze until the AI player is done taking all of his cards. I know that Swing is not thread safe, so I looked at Timers, but I could not understand how I could use one for this. Here is my current code:

while (JB.total < 21) {

          try {
            Thread.sleep(1000);
          } catch (InterruptedException ex) {
            System.out.println("Oh noes!");
          }

          switch (getJBTable(JB.total, JB.aces > 0)) {
            case 0:
              JB.hit();
              break;
            case 1:
              break done;
            case 2:
              JB.hit();
              JB.bet *= 2;
              break done;
          }
        }

BTW，hit（）;方法更新GUI。

BTW, the hit(); method updates the GUI.

推荐答案

以下代码显示了一个带有JTextArea和JButton的JFrame。当单击按钮时，Timer会重复发送事件（它们之间有第二个延迟）到与按钮相关的actionListener，该按钮会附加一行当前时间。

Well, the following code shows a JFrame with a JTextArea and a JButton. When the buttons is clicked, the Timer send the event repeatedly (with a second delay between them) to the actionListener related to the button which appends a line with the current time.

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.Calendar;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.Timer;


public class TimerTest extends JFrame implements ActionListener{

    private static final long serialVersionUID = 7416567620110237028L;
    JTextArea area;
    Timer timer;
    int count; // Counts the number of sendings done by the timer
    boolean running; // Indicates if the timer is started (true) or stopped (false)

    public TimerTest() {
        super("Test");
        setBounds(30,30,500,500);
        setDefaultCloseOperation(EXIT_ON_CLOSE);
        setLayout(null);

        area = new JTextArea();
        area.setBounds(0, 0, 500, 400);
        add(area);

        JButton button = new JButton("Click Me!");
        button.addActionListener(this);
        button.setBounds(200, 400, 100, 40);
        add(button);

        // Initialization of the timer. 1 second delay and this class as ActionListener
        timer = new Timer(1000, this);
        timer.setRepeats(true); // Send events until someone stops it
        count = 0; // in the beginning, 0 events sended by timer
        running = false;
        System.out.println(timer.isRepeats());
        setVisible(true); // Shows the frame
    }

    public void actionPerformed(ActionEvent e) {
        if (! running) {
            timer.start();
            running = true;
        }
        // Writing the current time and increasing the cont times
        area.append(Calendar.getInstance().getTime().toString()+"\n");
        count++;
        if (count == 10) {
            timer.stop();
            count = 0;
            running = false;
        }
    }

    public static void main(String[] args) {
        // Executing the frame with its Timer
        new TimerTest();
    }
}

嗯，这段代码是如何使用的示例javax.swig.Timer对象。关于问题的具体情况。停止计时器的if语句必须改变，显然，actionPerformed的动作。以下片段是解决方案actionBerformed的骨架：

Well, this code is a sample of how to use javax.swig.Timer objects. In relation with the particular case of the question. The if statement to stop the timer must change, and, obviously, the actions of the actionPerformed. The following fragment is a skeleton of the solution actionPerformed:

public void actionPerformed(ActionEvent e) {
    if (e.getComponent() == myDealerComponent()) {
    // I do this if statement because the actionPerformed can treat more components
        if (! running) {
            timer.start();
            runnig = true;
        }
        // Hit a card if it must be hitted
        switch (getJBTable(JB.total, JB.aces > 0)) {
          case 0:
              JB.hit();
              break;
          case 1:
              break done;
          case 2:
              JB.hit();
              JB.bet *= 2;
              break done;
        }
        if (JB.total >= 21) { // In this case we don't need count the number of times, only check the JB.total 21 reached
            timer.stop()
            running = false;
        }

    }
}

恕我直言解决问题，现在@ user920769必须考虑把actionListener放在哪里以及开始/停止条件...

IMHO this resolves the problem, now @user920769 must think where put the actionListener and the starting/stopping conditions...

@kleopatra：谢谢你告诉我这个计时器类的存在，我对它一无所知，这太棒了，可以将许多任务变成一个摇摆应用程序：）

@kleopatra: Thanks for show me the existence of this timer class, I don't know nothing about it and it's amazing, make possible a lot of tasked things into a swing application :)

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