说明：  3.设计一个幻灯片播放窗口，在窗口中点击鼠标时，在红、绿、蓝三种颜色的面板之间切换。程序文件命名为Exe8_3.java。
(3. Design a slideshow window, click the mouse, in between red, green, and blue switch panel in the window. Program file named Exe8_3.java.)