offScreen.drawImage(image1f,fishpos[0][0],fishpos[0][1],this);

        //省略其他小魚顯示代碼

        …

    //吃到小魚1，計算得分及生命值

    if(showfish1==1)

    if(mousex+70>=fishpos[0][0]&&mousex+70<=fishpos[0][0]+104&&

       mousey+32>=fishpos[0][1]&&mousey+32<=fishpos[0][1]+57)

    {

      life=life+6;

      if(life>100)

        life=100;

      score=score+6;

      fishpos[0][0]=0;

      fishpos[0][1]=40;

      showfish1=0;

}

//省略吃其他小魚代碼

…

    /*根據大鯊魚的坐標，決定是否顯示小魚*/

    if(mousey>300)

showfish1=1;

        //省略其他小魚是否顯示代碼

        …

    //顯示得分及時間

    offScreen.setFont(new Font("Dialog",Font.PLAIN,28));

    offScreen.setColor(Color.yellow);

    offScreen.drawString("得分:"+score,20,20);

offScreen.drawString(

"時間:"+(System.currentTimeMillis()-starttime)/1000,250,20);

    //顯示氣泡

    offScreen.setColor(Color.white);

    offScreen.fillOval(bubblepos[0][0],bubblepos[0][1],30,30);

    offScreen.fillOval(bubblepos[1][0],bubblepos[1][1],30,30);

    offScreen.fillOval(bubblepos[2][0],bubblepos[2][1],30,30);

    /*吃到氣泡，減少生命值，并重新計算氣泡位置*/    if(bubblepos[0][0]+15>=mousex&&bubblepos[0][0]+15<=mousex+139&&

       bubblepos[0][1]+15>=mousey&&bubblepos[0][1]+15<=mousey+64)

    {

      life=life-30;

      bubblepos[0][0]=100;

      bubblepos[0][1]=450;

    }    if(bubblepos[1][0]+15>=mousex&&bubblepos[1][0]+15<=mousex+139&&

       bubblepos[1][1]+15>=mousey&&bubblepos[1][1]+15<=mousey+64)

    {