java绘制一个成交量的统计图

("Param itemmonth error!");
   System.out.println(e);
}
    try{
      xCode=Subicode(getParameter("itemcode"));
      Len=xCode.length;
      hx=w/Len;
    }
    catch(Exception e){
      System.out.println("Param itemcode error!");
   System.out.println(e);
}
    try{
      yData=Substr(getParameter("itemval"));
    }
    catch(Exception e){
      System.out.println("Param itemval error!");
   System.out.println(e);
}
    try{
      xPce=Substr(getParameter("itempce"));
      MaxPce=getMaxVal(xPce);
      majStick=Integer.parseInt(MaxPce.substring(0,1))+2; //取最大pce的最大整数
    }
    catch(Exception e){
      System.out.println("Param itempce error!");
   System.out.println(e);
}
    try{
      addMouseListener(new MouseAdapter(){
        public void mouseReleased(MouseEvent evt){//检测释放鼠标按键事件
          setCursor(Cursor.getDefaultCursor());
          Point ioc=evt.getPoint();
          X=ioc.x;         //把当前座标传递给另一线程
          Y=ioc.y;
          //repaint();
        }
      });
   addMouseMotionListener(new MouseMotionAdapter(){
        public void mouseDragged(MouseEvent evt){
          Point ioc=evt.getPoint();
          if((ioc.x>leftMargine & ioc.x< w+leftMargine) & (ioc.y >topMargine & ioc.y< h+topMargine))
            setCursor(Cursor.getPredefinedCursor(Cursor.HAND_CURSOR));
          else
            setCursor(Cursor.getDefaultCursor());
        }
        public void mouseMoved(MouseEvent evt){   //检测鼠标移动事件