计算当前月有多少天

public static void main(String[] args) {

String monitorYear = "2012";

String monitorMonth = "11";

Calendar monthCal = new GregorianCalendar();

monthCal.set(Calendar.YEAR, Integer.valueOf(monitorYear));

monthCal.set(Calendar.MONTH, Integer.valueOf(monitorMonth));

monthCal.set(Calendar.DAY_OF_MONTH, 0);

int currentMonthMaxDay = monthCal.get(Calendar.DAY_OF_MONTH);

System.out.println(currentMonthMaxDay);

System.out.println(monthCal.getTime());

// monthCal.set(Calendar.MONTH, Integer.valueOf(monitorMonth) - 1);

// monthCal.set(Calendar.DAY_OF_MONTH, 0);

// int lastMonthMaxDay = monthCal.get(Calendar.DAY_OF_MONTH);

//

// System.out.println(lastMonthMaxDay);

//

// System.out.println(monthCal.getTime());

}