JAVA 框架显示系统时间

package Rong;
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Timer;
import java.util.TimerTask;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.SwingConstants;
import javax.swing.border.LineBorder;


public class TestStatus extends JFrame{
 private static final long serialVersionUID =1L;
 JLabel status=new JLabel();
 SimpleDateFormat s=newSimpleDateFormat("yyyy-MM-dd HH:mm:ss");
 
 Date d;
 public TestStatus(){
  this.setTitle("状态栏中实时显示系统时间");
  this.setSize(400, 400);
  Dimensiondim=Toolkit.getDefaultToolkit().getScreenSize();
  this.setLocation((dim.width-this.getWidth())/2,(dim.height-this.getHeight())/2);
 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  this.setVisible(true);
 
  Timer timer = new Timer();
  TimerTask tt = new TimerTask() {
   public void run() {
    d=newDate();
   status.setText(" 当前时间:"+ s.format(d));//显示系统日期时间
   status.setBorder(new LineBorder(Color.black, 1,false));//设置边框线
   status.setHorizontalAlignment(SwingConstants.CENTER);//设置文字在状态中居中显示
   }
   
  };
  timer.schedule(tt, 0, 1000); 
 this.getContentPane().add(status,BorderLayout.SOUTH);
 }
 public static void main(String args[]){
  new TestStatus();
 }
}