Java 写一个十分钟后发生的任务 用java写一个时钟

应用图形用户界面和多线程的知识，编写一个带界面的时钟程序，应用多线程实现时钟的走动，要求简单的数字时钟即可。

import java.awt.BorderLayout;
 import java.awt.Container;
 import java.util.Calendar;
 import java.util.GregorianCalendar;
 import javax.swing.JFrame;
 import javax.swing.JLabel;
 public class Clock {
 public Clock() {
 JFrame app = new JFrame(“电子时钟”);
 Container c = app.getContentPane();
 JLabel clock = new JLabel(“电子时钟”);
 clock.setHorizontalAlignment(JLabel.CENTER);
 c.setLayout(new BorderLayout());
 c.add(clock, BorderLayout.CENTER);
 app.setSize(160, 80);
 app.setLocation(600, 300);
 app.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 app.setVisible(true);
 Thread t = new MyThread(clock);
 t.start();
 }

class MyThread extends Thread {
	private JLabel clock;

	public MyThread(JLabel clock) {
		this.clock = clock;
	}

	public void run() {
		while (true) {
			clock.setText(this.getTime());
			try {
				Thread.sleep(1000);
			} catch (Exception e) {
				System.err.println(e);
			}
		}
	}

	public String getTime() {
		Calendar cl = new GregorianCalendar();
		String time = cl.get(Calendar.YEAR) + "-"
				+ (cl.get(Calendar.MONTH) + 1) + "-"
				+ cl.get(Calendar.DATE) + "";
		int h = cl.get(Calendar.HOUR_OF_DAY);
		int m = cl.get(Calendar.MINUTE);
		int s = cl.get(Calendar.SECOND);
		time += h + ":" + m + ":" + s;
		return time;
	}
}

public static void main(String args[]) {
	new Clock();
}