Recurrence 是一个小工具。 如果你刚好是Java程序员，又刚好需要一个日程表的重复事件的功能，可以用这个工具简单地实现Recurrence Rule。-Recurrence is a gadget. If you happen to be Java programmers, they just need a schedule repeating events, and Acid to Reduce Recurrence Rule can simply use this tool.