Frame顶层框架合理大小与图标添加源代码

class SizedFrame extends JFrame
{
   public SizedFrame()
   {
      // get screen dimensions

      Toolkit kit = Toolkit.getDefaultToolkit();
      Dimension screenSize = kit.getScreenSize();
      int screenHeight = screenSize.height;
      int screenWidth = screenSize.width;
      

      // set frame width, height and let platform pick screen location

      setSize(screenWidth / 2, screenHeight / 2);
      setLocationByPlatform(true);

      // set frame icon

      Image img = new ImageIcon("icon.gif").getImage();
      setIconImage(img);      
      
   }
}