import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.SimpleDateFormat;
import java.util.Date;
import javax.swing.JLabel;
import javax.swing.Timer;
import javax.swing.JFrame;
public class NowTime extends JFrame //添加 显示时间的JLabel
public  NowTime(){
JLabel time = new JLabel();
add(time);
this.setTimer(time);
//设置Timer 1000ms实现一次动作 实际是一个线程
private void setTimer(JLabel time){
final JLabel 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();
//运行方法
public static void main(String[] args) { NowTime timeFrame = new NowTime(); timeFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

timeFrame.setSize(160, 80);

this.setLocation((int) (Toolkit.getDefaultToolkit().getScreenSize().getWidth() - this.getWidth()) / 2,

(int) (Toolkit.getDefaultToolkit().getScreenSize().getHeight() - this.getHeight()) / 2);//居中显示窗体

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