JAVA电子时钟

import java.awt.*;
import java.util.*;

import javax.swing.*;
public class HyClock extends JFrame implements Runnable{
	public static JLabel tm;
	public static  HyClock hytime;
	public void run()
	{while(true){

		Calendar c=Calendar.getInstance();
		String nowtime=c.get(Calendar.HOUR_OF_DAY)+":"+c.get(Calendar.MINUTE)+":"+c.get(Calendar.SECOND);
	
		tm.setText(nowtime);
		
		try {
			Thread.sleep(1000);
		} catch (InterruptedException e) {
		}
		
	}
	}
	public static void main(String[] agrs)
	{
		hytime=new HyClock();
		hytime.setLayout(new FlowLayout());
		tm=new JLabel();
		tm.setFont(new Font("宋体",1,40));
		tm.setForeground(Color.RED);
		hytime.add(tm);
		hytime.setDefaultCloseOperation(DISPOSE_ON_CLOSE);
		hytime.setSize(300,100);
		hytime.setVisible(true);
		hytime.setLocation(400,400);
		Thread t=new Thread(hytime);
		t.start();
		
	}
}

效果图