51单片机外中断，java源码写的万年历，继承和多态的相关源码-51 MCU external interrupt, the java source code to write the calendar, inheritance and polymorphism related to source

java小程序，万年历，任意输入某年某月，以月历的形式打印出该月。-Java applet, calendar, any input in a certain period, print out the form of a calendar month.