java获取当月天数，指定年月的天数，指定日期获取对应星期

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package com;import java.text.SimpleDateFormat;import java.util.Calendar;import java.util.Date;/** * @author Gerrard */public class TestGetWeek {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;}}

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