JavaSE series code 68: Screening of cartoons

§ blocked - a thread is said to be blocked when it is waiting for an event, such as an input / output operation. § dead – the thread is dead after the run() method has completed execution or its stop() method has been called.

import java.util.*;
import java.awt.*;
import java.applet.*;
public class Javase_68 extends Applet implements Runnable
{
  Thread thrpic=null;
  Image[] frame=new Image[10];
  int frame_i=0,delay_time;
  public void init() 
  {
    int i;
    String fps;
    for(i=0;i<frame.length;i++)   //加载图像到数组中
     frame[i]=getImage(getDocumentBase(),"image/picture"+i+".gif");
    fps=getParameter("frame_per_second");
    if(fps==null)  fps="10";
    delay_time=1000/Integer.parseInt(fps);   //设置两张图处理相隔的时间
  }
  public void paint(Graphics g)
  {
    g.drawImage(frame[frame_i],0,0,this);
  }
  public void start()
  {
    if(thrpic==null)
    {
       thrpic=new Thread(this);
       thrpic.start();
    }
  }
  public void stop()
  { 
    thrpic.interrupt();
    thrpic=null; 
  }    
  public void run()
  {
    while(true)
    {
      try { Thread.sleep(delay_time); }
      catch (InterruptedException e) { }
      repaint();
      frame_i=(frame_i+1)%frame.length;
    }
  }
}