Label显示时间

package 第十一章;

import java.awt.Button;
import java.awt.Color;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Label;
import java.awt.Panel;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.*;

public class shijian extends Frame{

	Panel pan=new Panel();
	Label lbl=new Label();
	Button btn=new Button("开始");

	public shijian(String str) {
		super(str);
	}
	public shijian(){
		buju();
	}
	public static void main(String agrs[]){
		shijian sj=new shijian();
	}
	public void buju(){
		shijian f=new shijian("显示时间");
		f.setSize(500,500);
		f.setBackground(Color.gray);
		f.setLayout(null);
		f.setVisible(true);

		pan.setSize(500, 500);
		pan.setLocation(0, 0);
		pan.setBackground(Color.darkGray);
		pan.setLayout(null);

		lbl.setSize(300,100);
		lbl.setLocation(100, 100);
		lbl.setBackground(Color.yellow);
//		lbl.setFont();
		Font kl=new Font("宋体",0,25);
		lbl.setFont(kl);

		btn.setSize(100,50);
		btn.setLocation(200, 250);
		btn.addActionListener(new ActionListener(){

			@Override
			public void actionPerformed(ActionEvent e) {
				// TODO Auto-generated method stub
//				if(btn.s)
				kaishi(e);
			}});
		pan.add(btn);
		pan.add(lbl);
		f.add(pan);
	}
	public void kaishi(ActionEvent e){
		while(true){
			Date d=new Date();
//			long l1=d.getTime();
			lbl.setText(d.toLocaleString());
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e1) {
				// TODO Auto-generated catch block
				e1.printStackTrace();
			}
		}

	}

}