为什么不能在公共起落架方法中调用专用喷漆方法？

Question

这是用于调用方法的代码：

    public void landingGearConditions(MouseEvent event)
                {
                  if (event.getButton() == MouseEvent.BUTTON1)
                    System.out.println("landing gear activated");
                    paintGears();
                  if (event.getButton() == MouseEvent.BUTTON3)
                    System.out.println("landing gear retracted");
                    paintRetractedGears();
            }  

这是用于油漆前后轮胎的代码：

    private void paintGears(Graphics page)
      {
        super.paintComponent(page);
         page.setColor(Color.black);  //set color for the tires

        page.fillOval(planex+126,planey+75,16,16); //front tire
        page.fillOval(planex+275,planey+79,16,16); //back tire
      }

      private void paintRetractedGears(Graphics page)
      {
        super.paintComponent(page);
         page.setColor(Color.blue);  //set color for the tires

        page.fillOval(planex+126,planey+75,16,16); //front tire
        page.fillOval(planex+275,planey+79,16,16); //back tire
      }

错误的含义是，“ Plane2类型的方法paintRetractedGears（java.awt.Graphics）不适用于参数（）”