Java写的一个类似windows自带的日历程序，他除了可以浏览日期外，还可以在特定的时间点写备忘录，当到达该时间点时会有弹窗提示。-Java to write a similar to windows built-in calendar program, he not only can browse the date, can also write memos at specific time points, when the time reaches will pop-up prompts.