Java Calendar getFirstDayOfWeek() 方法

2024年11月3日 | 阅读 2 分钟

java.util.Calendar.getFirstDayOfWeek() 类的方法。它以整数形式返回一周的第一天。即，DAY 字段的相应整数值。getFirstDayOfWeek() 方法不接受任何参数。

语法

参数

不传递任何参数。

返回值

以整数形式返回一周的第一天。

抛出

不抛出异常。

示例 1

import java.util.Calendar;
public class JavaCalendargetFirstDayOfWeekExample1 {
	public static void main(String[] args) {
		Calendar calobj = Calendar.getInstance(); 
		System.out.println("first day of current week:"
				+ calobj.getFirstDayOfWeek());
                
                calobj.add(Calendar.YEAR, 1996);
                 calobj.add(Calendar.MONTH, 9);
                  calobj.add(Calendar.DAY_OF_WEEK, 23);
                  
                  System.out.println("If date is  " + calobj.getTime() + "  then first day of week is  "
				+ calobj.getFirstDayOfWeek());
                
		calobj.setFirstDayOfWeek(Calendar.TUESDAY);
		System.out.println("now first day of week :" 
				+ calobj.getFirstDayOfWeek());
	}
}

输出

first day of current week:1
If date is  Wed May 27 13:42:54 PDT 4015  then first day of week is  1
now first day of week :3

示例 2

import java.util.Calendar;
import java.util.Locale;
public class JavaCalendargetFirstDayOfWeekExample2 {  
public static void main(String[] args) {
    Calendar mycal = Calendar.getInstance(new Locale("us"));
    int first = mycal.getFirstDayOfWeek();
    System.out.println(" First Day Of week is :" + first );
    //cchecking if first day is monday or not
    if (first != Calendar.MONDAY) {
         System.out.println("First day of week should be monday !!");
    }

    Calendar mycal2 = Calendar.getInstance(new Locale("uk","UA"));
    int first2 = mycal2.getFirstDayOfWeek();
    if ( first2 == Calendar.MONDAY) {
        System.out.println(" in uk local  First day of week is Monday  !!");
    }
}
}

输出

First Day Of week is :1
First day of week should be monday !!
 in uk local  First day of week is Monday  !!

示例 3

import java.util.Calendar;
public class JavaCalendargetFirstDayOfWeekExample3 {   
    public static void main(String[] args) {

      // create a new calendar 
      Calendar mycal = Calendar.getInstance();

      // print the first day of the week
      System.out.println("First day is :" + mycal.getFirstDayOfWeek());
      int firsD = mycal.getFirstDayOfWeek();
      switch (firsD) {
         case 1:
         case 2:
         case 3:
            System.out.println("First Day of Week can be following : Monday , Tuesday , Wednesday");
            break;
         case 4:
         case 5:  
         case 6:
            System.out.println("First Day of Week can be following : Thirsday , Friday , saturday");
            break;
         case 7:
            System.out.println("First Day is Sunday");
            break;
      }
   }  
}

输出

First day is :1
First Day of Week can be following : Monday , Tuesday , Wednesday

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Java Calendar getFirstDayOfWeek() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

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Java Calendar getFirstDayOfWeek() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

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