JPanel绘图

class NewPanel extends JPanel   {     public NewPanel(){}      public void paintComponent(Graphics g)      {          int p_width = 0;       int p_height = 0;       String imgURL= MakeFrame.filepath;//文件路径  System.out.println(imgURL);       ImageIcon icon = new ImageIcon(imgURL);      p_width = icon.getIconWidth();        p_height = icon.getIconHeight();        g.drawImage(icon.getImage(),20,20,p_width,p_height,null);   g.dispose();        }     }