java 中javax.swing.timer类的初步使用

建立了一个按钮，按钮上自动更新显示数字。

</pre><pre name="code" class="java">package com.demo;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.*;
import javax.swing.*;

public class demo extends JFrame {  
private int delay;
private  int count;
private JButton jbt = new JButton();

public demo(){
JPanel panel = new JPanel();
int delay = 1000; //milliseconds
            panel.add(jbt);
           Timer timer = new Timer(delay, new TimerListener());    
            timer.start();
            this.add(panel);
}
private class TimerListener implements ActionListener{

@Override
public void actionPerformed(ActionEvent e) {
count++;
jbt.setText(""+count);
jbt.repaint();

}

}


    public static void main(String[] args) {  
    demo mydemo = new demo();
    mydemo.setTitle("MyDemo");
    mydemo.setSize(200, 200);
    mydemo.setLocationRelativeTo(null);
    mydemo.setVisible(true);
    mydemo.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    }  
}

结果如下：按钮上可以自动更新数字，以此为基础可以衍生出倒计时器。