如何能让程序正常运行并且显示面板，请在基础上添加程序！

Question

import java.awt.event.*;
import java.awt.*;class TestStopWatch extends Frame
{
public TestStopWatch()
{
this.add(new StopWatch());
addWindowListener(new WindowAdapter()
{
public void WindowClosing(WindowEvent e)
{
dispose();
System.exit(0);
}
});
}
public static void main(String []args)
{
TestStopWatch sw=new TestStopWatch();
}
}import java.awt.*;
import java.awt.Canvas;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.awt.event.*;public class StopWatch extends Canvas implements Runnable
{
long startTime=0;
long endTime=0;
boolean start=false;
public StopWatch()
{
enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
protected void processMouseEvent(MouseEvent e)
{
if(e.getID()==MouseEvent.MOUSE_CLICKED)
{
startTime=endTime=System.currentTimeMillis();
repaint();
start=true;
new Thread(this).start();
}else if(e.getID()==MouseEvent.MOUSE_RELEASED)
{
endTime=System.currentTimeMillis();
repaint();
start=false;
}
}
public void paint(Graphics g)
{
SimpleDateFormat sdf=new SimpleDateFormat("HH:mm:ss");
Date date=null;
try
{
date=sdf.parse("00:00:00");
}catch(Exception e)
{
e.printStackTrace();
}
date.setTime(date.getTime()+endTime-startTime);
//new Date(endTime-startTime);
String strName=sdf.format(date);
g.fill3DRect(0,0,78,28,true);
g.setColor(Color.WHITE);
g.drawString(strName,10,20);
}
public void run()
{
while(start)
{
try
{
Thread.sleep(500);
}catch(Exception e)
{
e.printStackTrace();
}
endTime=System.currentTimeMillis();
repaint();
}
}
}

Answer 1

我帮你改了TestStopWatch，你主要是没有用setVisible将界面显示出来
import java.awt.event.*;
import java.awt.*;class TestStopWatch extends Frame
{
    public TestStopWatch()
    {
        this.add(new StopWatch());    
        addWindowListener(new WindowAdapter()
        {
            public void windowClosing(WindowEvent e) //这里写错了,你写成WindowClosing了
            {
                dispose();
                System.exit(0);
            }
        });
    }
    public static void main(String []args)
    {
        TestStopWatch sw=new TestStopWatch();
        //下面还要加两句
        sw.setSize(400, 300);
        sw.setVisible(true);
    }
}