获得某个日期当月的最后一天和某一日

public static void main(String[] args) { Calendar cal = Calendar.getInstance(); cal.set(cal.DATE, 1); cal.roll(cal.DATE, -1); System.out.println(cal.getTime());//获得时间 System.out.println(cal.get(cal.DAY_OF_MONTH));//获得日 }