利用runnable接口和Thread类 创建一个数字时钟小程序

利用runnable接口和Thread类 创建一个数字时钟小程序：

import javax.swing.*;import java.awt.*;import java.lang.*;import java.util.*;public class ClockTest extends JFrame{ClockPane clockPane;public ClockTest(){setTitle("Clock Program");clockPane=new ClockPane();//JPanel pane=new JPanel();//pane.setLayout(new GridLayout(1,1,16,16));//pane.add(clockPane);setContentPane(clockPane);}/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubClockTest test=new ClockTest();test.pack();test.setVisible(true);}}class ClockPane extends JPanelimplements Runnable{Thread thread;public ClockPane(){if(thread==null){thread=new Thread(this);thread.start();}}@Overridepublic void run() {// TODO Auto-generated method stubwhile(true){repaint();try{Thread.sleep(1000);}catch(Exception e){}}}@Overrideprotected void paintComponent(Graphics arg0) {// TODO Auto-generated method stubGraphics2D comp2D=(Graphics2D)arg0;//comp2D.setBackground(Color.black);//comp2D.fillRect(0, 0, getSize().width, getSize().height);//comp2D.setFont(new Font("浪漫雅园",Font.BOLD,15));comp2D.clearRect(0, 0, 666, 550);comp2D.setColor(Color.RED);Calendar cal=Calendar.getInstance(); comp2D.drawString(cal.getTime().toString(), 10, 50);}}