java – 每次单击时重绘具有不同图像的JPanel

我还是 Java的新手,我有以下问题.
正如你在下面看到的那样,我创建了一个带有图像的JPanel,每当我点击面板时我想要更改它,但是由于某种原因它不起作用.我已经坐了几个小时了,似乎完全卡住了.如果你能看一下代码并帮助我,我将非常感激.
谢谢你,祝圣诞快乐.

public class Level {
  JPanel panel
  String img1Path = "img1.png";
  String img2Path = "img2.png";
  Image img1 = Toolkit.getDefaultToolkit().getImage(img1Path);
  Image img2 = Toolkit.getDefaultToolkit().getImage(img2Path);
  boolean s1 = false;

  public Level(){
    initGUI();
  }

  public void initGUI(){
    panel = new JPanel(){
      public void paintComponent(Graphics g){
       super.paintComponent(g);
       draw(g,s1);
      }
    }
   panel.addMouseListener(new ImgListener(s1));
  }

  public void draw(Graphics g,boolean s){
    if(s==true){
      g.drawImage(img1,this);}
    else if(s==false){
      g.drawImage(img2,this);}
    }//draw()

  public void click(boolean s,boolean b){
    s = b;
    repaint();
  }

  public class ImgListener extends MouseAdapter {
    boolean s;

    public ImgListener(boolean s){
      pS(s);
    }

    public void mouseClicked(MouseEvent e){
      if(s==true){
        click(s,false);
      }
      else if(s==false){
        click(s,true);
      }
   }//mouseClicked

  public void pS(boolean s){
    this.s = s;
   }//pS

  }//ImgListener

}//Level

public void click(boolean s,boolean b){
  s = b;  // this does not change the class field s.
  repaint();
}

public void mouseClicked(MouseEvent e){
  if(s==true){
    click(s,false); 
  }
  else if(s==false){
    click(s,true);
  }
}

public void mouseClicked(MouseEvent e){
  s = !s;
  repaint();
}