java取得某个月的天数

 

		Calendar cal = Calendar.getInstance();
		cal.set(Calendar.YEAR, Integer.parseInt(year));
		cal.set(Calendar.MONTH, Integer.parseInt(month) - 1);
		cal.set(Calendar.DATE, 1);
		cal.add(Calendar.MONTH, 1);
		cal.add(Calendar.DATE, -1);
		int j = cal.get(Calendar.DAY_OF_MONTH);