java - Java Blink JButton在2秒钟内

我希望程序在使按钮闪烁的同时等待2秒。
我的闪烁按钮有以下代码：

import javax.swing.*;
import java.awt.event.*;
import java.awt.Color;

public class a
{
    static JFrame frame = new JFrame();
    static JButton button = new JButton("Hello");

    public static void main(String[] args) {
        frame.add(button);
        frame.pack();
        frame.setVisible(true);
        blinking();   //this is the blinking part
        //this is where the waiting 2 seconds should be
        JOptionPane.showMessageDialog(null,"Popup message", "Title", JOptionPane.PLAIN_MESSAGE);
        //rest of the code of my program
    }

    private void blinking() {
        button.setOpaque(true);
        Timer blinkTimer = new Timer(500, new ActionListener() {
            boolean on=false;
            public void actionPerformed(ActionEvent e) {
                // blink the button background on and off
                button.setBackground( on ? Color.YELLOW : null);
                on = !on;
            }
        });
        blinkTimer.start();
    }
}

我希望程序在2秒钟内闪烁，然后打开JOptionPane。它正在做的是无需等待2秒钟即可打开JOptionPane。
我尝试使用Thread.sleep(2000)进行等待，但是它似乎不起作用，在那2000毫秒的等待时间内按钮没有闪烁。
有什么建议么？

注意 ：
我无法将JOptionPane从main（）中移出。

最佳答案

使用已经拥有的Timer来帮助您确定2秒钟何时结束，并且可以通过在Timer内部计数调用actionPerformed方法的次数来做到这一点。当它被叫4次（2秒）时，请停止定时器。这很简单：

Timer blinkTimer = new Timer(500, new ActionListener() {
    private int count = 0;
    private int maxCount = 4;
    private boolean on = false;

    public void actionPerformed(ActionEvent e) {
        if (count >= maxCount) {
            button.setBackground(null);
            ((Timer) e.getSource()).stop();
        } else {
            button.setBackground( on ? Color.YELLOW : null);
            on = !on;
            count++;
        }
    }
});
blinkTimer.start();

您还告诉我您想以某种方式暂停此程序的执行，为此，我建议您创建一个方法，例如enableExecution(boolean)为您执行此操作，然后在启动计时器，计时器结束后您会再次调用它，例如：

Timer blinkTimer = new Timer(500, new ActionListener() {
    private int count = 0;
    private int maxCount = 4;
    private boolean on = false;

    public void actionPerformed(ActionEvent e) {
        if (count >= maxCount) {
            button.setBackground(null);
            ((Timer) e.getSource()).stop();
            enableExecution(true);   //  ***** re-enable execution of whatever *****

        } else {
            button.setBackground( on ? Color.YELLOW : null);
            on = !on;
            count++;
        }
    }
});

enableExecution(false);   //  ***** disable execution of whatever *****
blinkTimer.start();

编辑
关于您编辑的代码，我仍然认为最好的解决方案是再次调用从您的计时器中显示对话框的代码。如果您的问题是调用计时器的类没有在对话框中正确显示所需的信息，请考虑将这些信息传递给该类。例如：

import java.awt.Color;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;

public class BetterA extends JPanel {
   private static final int TIMER_DELAY = 500;
   private JButton button = new JButton("Hello");

   // information needed by the dialog:
   private String message;
   private String title;

   public BetterA(String message, String title) {
      add(button);
      blinking();

      // set the dialog information
      this.message = message;
      this.title = title;
   }

   private void blinking() {
      button.setOpaque(true);
      Timer blinkTimer = new Timer(TIMER_DELAY, new ActionListener() {
         private int count = 0;
         private int maxTime = 2000;
         private boolean on = false;

         public void actionPerformed(ActionEvent e) {
            if (count * TIMER_DELAY >= maxTime) {
               button.setBackground(null);
               ((Timer) e.getSource()).stop();
               Window win = SwingUtilities.getWindowAncestor(BetterA.this);
               JOptionPane.showMessageDialog(win, message, title,
                     JOptionPane.PLAIN_MESSAGE);
            } else {
               button.setBackground(on ? Color.YELLOW : null);
               on = !on;
               count++;
            }
         }
      });
      blinkTimer.start();
   }

   private static void createAndShowGui() {
      String myMessage = "Popup message";
      String myTitle = "Some Title";

      BetterA mainPanel = new BetterA(myMessage, myTitle);

      JFrame frame = new JFrame("BetterA");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}

编辑2

另一个选择是使用Swing的固有PropertyChangeListener支持。例如：

import java.awt.Color;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.*;

public class BetterA2 extends JPanel {
   private static final int TIMER_DELAY = 500;
   private static final int MAX_TIME = 2000;
   private static final String READY = "ready";
   private JButton button = new JButton("Hello");

   public BetterA2() {
      add(button);
      blinking();
   }

   private void blinking() {
      button.setOpaque(true);
      Timer blinkTimer = new Timer(TIMER_DELAY, new ActionListener() {
         private int count = 0;
         private boolean on = false;

         public void actionPerformed(ActionEvent e) {
            if (count * TIMER_DELAY >= MAX_TIME) {
               button.setBackground(null);
               ((Timer) e.getSource()).stop();

               // !!!
               firePropertyChange(READY, READY, null);
            } else {
               button.setBackground(on ? Color.YELLOW : null);
               on = !on;
               count++;
            }
         }
      });
      blinkTimer.start();
   }

   private static void createAndShowGui() {
      final BetterA2 mainPanel = new BetterA2();
      mainPanel.addPropertyChangeListener(BetterA2.READY,
            new PropertyChangeListener() {

               @Override
               public void propertyChange(PropertyChangeEvent evt) {
                  JOptionPane.showMessageDialog(mainPanel, "Popup message",
                        "Title", JOptionPane.PLAIN_MESSAGE);
               }
            });

      JFrame frame = new JFrame("BetterA");
      frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
      frame.getContentPane().add(mainPanel);
      frame.pack();
      frame.setLocationByPlatform(true);
      frame.setVisible(true);
   }

   public static void main(String[] args) {
      SwingUtilities.invokeLater(new Runnable() {
         public void run() {
            createAndShowGui();
         }
      });
   }
}