Java Swing 系统时间动态显示

package test;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;

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

public class TestIFrame extends JFrame {
private JTextField time;
SimpleDateFormat myfmt = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");

public TestIFrame(){
super();
setBounds(100, 100, 200, 200);
setDefaultCloseOperation(EXIT_ON_CLOSE);

time = new JTextField();
this.add(time,BorderLayout.CENTER);
time.addActionListener(new TimeActionListener());
setVisible(true);

}

//添加状态栏“时间文本框”的事件监听器，用来实现动态刷新时间
class TimeActionListener implements ActionListener{
public TimeActionListener(){
javax.swing.Timer t=new javax.swing.Timer(1000,this);
t.start();
}

@Override
public void actionPerformed(ActionEvent ae){
time.setText(myfmt.format(new java.util.Date()).toString());
}
}

public static void main(String[] args){
new TestIFrame();
}

}