日期:2014-05-20  浏览次数:20626 次

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!
Java code

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();
    }
}



Java code

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();
        }
    }
}



------解决方案--------------------
我帮你改了TestStopWatch,你主要是没有用setVisible将界面显示出来

Java code

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);
    }
}