lyj.java

这是一些学生的JAVA课程设计

//<applet code=lyj.class width=600 height=400></applet>
import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class lyj extends Applet implements Runnable
{
Cursor c=new Cursor(Cursor.HAND_CURSOR);
Thread t=null;
Image imgs[]=new Image[19];
String text="神秘太空---刘雅静 ";
int len=text.length();
int n=0,num=0;
MediaTracker tracker;
Image offimg;
Graphics offg;
AudioClip ad;
public void stop()
{
if(t!=null)
{t.stop();
 t=null;
}
if(ad!=null)
{
  ad.stop();
  ad=null;
}
}
public void init()
{
tracker=new MediaTracker(this);
setSize(600,400);
ad=getAudioClip(getCodeBase(),"space.au");
for(int i=0;i<19;i++)
{imgs[i]=getImage(getCodeBase(),String.valueOf(i+1)+".jpg");
tracker.addImage(imgs[i],0);
showStatus("Loading "+(i+1)+"Picture");
}
this.setCursor(c);
this.addMouseListener(new lister(this));
try
{
tracker.waitForID(0);
}
catch(Exception e){}
offimg=createImage(600,400);
offg=offimg.getGraphics();

}
public void run()
{
while(t==Thread.currentThread())
{
 try
    {
     repaint();
     t.sleep(800);
     num++;
     n++;
     if(n>18)
      n=0;
     if(num>len-1)
       num=0;  
   }catch(Exception e){}
    
}
}

class lister extends MouseAdapter
{
lyj list;
lister(lyj list)
{
  this.list=list;
}
public void mouseEntered(MouseEvent e)
{
 if(t==null)
    {
      t=new Thread(list);
      t.start();
      ad.loop();
     }
}
public void mouseExited(MouseEvent e)
{
if(t!=null)
{t.stop();
 t=null;
 ad.stop();
}
}
}
public void paint(Graphics g)
{
float rr=(float)Math.random();
float gg=(float)Math.random();
float bb=(float)Math.random();
Color c=new Color(rr,gg,bb); 
g.drawImage(imgs[n],0,0,this);
g.setColor(c);
g.setFont(new Font("隶书",Font.BOLD,40));
g.drawString(text.substring(0,num),50,360);  
}
public void update(Graphics g)
{
if(offg!=null)
{paint(offg);
g.drawImage(offimg,0,0,this);
}
else
paint(g);
}
}