java实现日历Writeajavaprogramnamedcal(themain()shouldbeinaclassnamed"cal")thatwillprintouttostandardoutputthecalendarforanymonth.Yourprogramshouldlookatthecommandlineargumentsforanumericmonthandyear,andprintthecalendarforthatmonthintheformatdisplayedbelow.Iftherearenoc