swing时钟

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();

    }

}