java获取当月天数，指定年月的天数，指定日期获取对应星期

java获取当月天数，指定年月的天数，指定日期获取对应星期

public static void main(String[] args) {

int currentMaxDays = getCurrentMonthDay();

int maxDaysByDate = getDaysByYearMonth(2012, 11);

String week = getDayOfWeekByDate("2012-12-25");

System.out.println("本月天数：" + currentMaxDays);

System.out.println("2012年11月天数：" + maxDaysByDate);

System.out.println("2012-12-25是：" + week);

}

/**

* 获取当月的 天数

* */

public static int getCurrentMonthDay() {

Calendar a = Calendar.getInstance();

a.set(Calendar.DATE, 1);

a.roll(Calendar.DATE, -1);

int maxDate = a.get(Calendar.DATE);

return maxDate;

}

/**

* 根据年 月 获取对应的月份 天数

* */

public static int getDaysByYearMonth(int year, int month) {

Calendar a = Calendar.getInstance();

a.set(Calendar.YEAR, year);

a.set(Calendar.MONTH, month - 1);

a.set(Calendar.DATE, 1);

a.roll(Calendar.DATE, -1);

int maxDate = a.get(Calendar.DATE);

return maxDate;

}

/**

* 根据日期 找到对应日期的 星期

*/

public static String getDayOfWeekByDate(String date) {

String dayOfweek = "-1";

try {

SimpleDateFormat myFormatter = new SimpleDateFormat("yyyy-MM-dd");

Date myDate = myFormatter.parse(date);

      SimpleDateFormat formatter = new SimpleDateFormat("E");

      String str = formatter.format(myDate);

      dayOfweek = str;

} catch (Exception e) {

System.out.println("错误!");

}

return dayOfweek;

}