swing动态时间显示

:) 运行效果(当然是动态的)：
[img]http://dl.iteye.com/upload/attachment/195975/46c1fdc0-b6c8-3aa9-ade0-90ad986f7c71.jpg[/img]
:) Code：

package test.gui;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;

import javax.swing.JTextField;
import javax.swing.Timer;
import javax.swing.JFrame;

public class GUITimer extends JFrame{

	//添加 显示时间的JTextField
	private void addComponent(){
		JTextField time = new JTextField();
		this.getContentPane().add(time);
		this.setTimer(time);
	}
	//显示窗口
	private void showTime(){
		this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		//this.pack();//自动适应窗口大小
		this.setSize(160, 80);
		this.setVisible(true);
	}

	//设置Timer 1000ms实现一次动作 实际是一个线程
	private void setTimer(JTextField time){
		final JTextField varTime = time;
		Timer timeAction = new Timer(1000, new ActionListener() {		

			public void actionPerformed(ActionEvent e) {	
				long timemillis = System.currentTimeMillis();
				//转换日期显示格式
				SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
				varTime.setText(df.format(new Date(timemillis)));
			}	
		}); 		
		timeAction.start();		
	}

	public static void main(String[] args) {
		GUITimer timeFrame = new GUITimer();
		timeFrame.addComponent();
		timeFrame.showTime();
	}

}