通過具體的年月獲取當前年月中最大天數、本天所屬周！
阿新 • • 發佈：2019-02-14
public class test {
public static void main(String[] args) {
int currentMaxDays = getCurrentMonthDay();
int maxDaysByDate = getDaysByYearMonth(2012, 11);
String week = getDayOfWeekByDate("2012-12-25");
System.out.println("本月天數：" + currentMaxDays);
System.out.println("2012年11月天數：" + maxDaysByDate);
System.out.println("2012-12-25是：" + week);
}
/**
* 獲取當月的 天數
* */
public static int getCurrentMonthDay() {
Calendar a = Calendar.getInstance();
a.set(Calendar.DATE, 1); //年
a.roll(Calendar.DATE, -1); //月
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
/**
* 根據年 月 獲取對應的月份 天數
* */
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;
}
/**
* 根據日期 找到對應日期的 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("錯誤!");
}
return dayOfweek;
}
}
public static void main(String[] args) {
int currentMaxDays = getCurrentMonthDay();
int maxDaysByDate = getDaysByYearMonth(2012, 11);
String week = getDayOfWeekByDate("2012-12-25");
System.out.println("本月天數：" + currentMaxDays);
System.out.println("2012年11月天數：" + maxDaysByDate);
System.out.println("2012-12-25是：" + week);
}
/**
* 獲取當月的 天數
* */
public static int getCurrentMonthDay() {
Calendar a = Calendar.getInstance();
a.set(Calendar.DATE, 1); //年
a.roll(Calendar.DATE, -1); //月
int maxDate = a.get(Calendar.DATE);
return maxDate;
}
/**
* 根據年 月 獲取對應的月份 天數
* */
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;
}
/**
* 根據日期 找到對應日期的 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("錯誤!");
}
return dayOfweek;
}
}