该java文件实现一个缓冲界面的效果，同时底下带有控制的同步进度条，当进度条加载完毕后，直接跳到另外一个界面，这个功能在很多地方都有用到，比如一些软件启动后的欢迎界面，实现这个功能，主要是实现javax.swing包中的JWindown类.-The java files to achieve the effect of a buffer interface under control with synchronization progress bar to jump directly to another interface, when the progress bar is loaded, this function is used in many places, such as some software startup welcome interface to achieve this function, is mainly achieved the javax.swing package JWindown class.