Java多线程的简单应用

package Q2; import java.applet.*; import java.awt.*; import java.awt.event.*; public class ThreadTest extends Applet implements Runnable { Thread left ,right, up; Graphics mypen; AudioClip clip; int x,y; public void init() { clip=getAudioClip(getCodeBase(),"tnt.mp3"); left=new Thread(this); right=new Thread(this); up=new Thread(this); x=10;y=10; mypen=getGraphics(); } public void start() { left.start(); right.start(); up.start(); } public void run() { while(true) { if(Thread.currentThread()==left) { x=x+1; if(x>240) x=10; mypen.setColor(Color.blue); mypen.clearRect(10,10,300,40); mypen.drawRect(10+x,10,40,40); try{ left.sleep(300); } catch(InterruptedException e){} } if(Thread.currentThread()==right) { y=y+1; if(y>240) y=10; mypen.setColor(Color.red); mypen.clearRect(10,90,300,40); mypen.drawOval(10+y,90,40,40); try{ right.sleep(300); } catch(InterruptedException e){} } if(Thread.currentThread()==up){ clip.play(); try{ left.sleep(30000); }catch(Exception e){ } } } } }