获得某月最后一天，每月天数

import java.util.Canlendar;

Canlendar c=Canlendar.getInstance();c.set(2005,1,1);int a=get(Canlendar.MAY_OF_MONTH);//a=1c.set(2005,1,0);a=get(Canlendar.MAY_OF_MONTH);//a=31