编写一个Java GUI应用程序，窗口标题为“GridLayout”，窗口布局如下图A所示，在图A窗口中单击任意一个Button，网格的划分方式会变化为图B；在图B窗口中单击任意一个Button，网格的划分方式会变化为图A-Write a Java GUI application, the window titled " GridLayout" , the window layout as shown in Figure A, in Figure A window, click