import java.awt.*;import java.util.*;import javax.swing.*;public class HyClock extends JFrame implements Runnable {    public static JLabel tm;    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) {        HyClock  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();    }}

 

import

java.awt.*;

import

java.util.*;

import

javax.swing.*;

public

class

HyClock

extends

JFrame

implements

Runnable {

    

public

static

JLabel tm;

    

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) {

        

HyClock  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();

    

}

}