//Bullets.png /*********************************************************子弹类*/ class BulletsSprite implements Runnable{  private Sprite bullet;  private boolean end=true;  private int Xbullets=3,Ybullets;  public BulletsSprite() { try{  bullet=new Sprite(Image.createImage("/Bullets.png"),9,3);    } catch(Exception e){}  bullet.setPosition(20,30); Thread tt=new Thread(this); tt.start(); }  public void run(){ Graphics g=getGraphics(); while(end){  update(); draw(g);  try{Thread.sleep(20);} catch(Exception e){}    }    }  private void update(){ bullet.move(Xbullets,0);        }  private void draw(Graphics g){  bullet.paint(g);  flushGraphics();          }                       }

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