JAVA编写的时钟，在同一框中显示出不同时区的时间的动态时钟，画面糙了点，但体现了原理，很好的学习程序-JAVA prepared by the clock, the box shows the same time zone time of dynamic clock, roughness of the screen, but embodies the principles of good learning process

swing,点击事件改变pane元素,没有使用swingwoker方法.通过swing元素的set方法来达到改变的目的-swing, click event to change the pane element