Java Calendar setFirstDayOfWeek() 方法

2024年11月3日 | 阅读 2 分钟

Calendar 类的 SetFirstDayOfWeek() 方法用于设置一周的第一天。要设置为一周第一天的值作为参数传递。

语法

参数

value - 要设置为一周的第一天。

返回值

不适用

抛出

不适用

示例 1

import java.util.Calendar;
public class JavaCalendarsetFirstDayOfWeekExample1 {
public static void main(String[] args) {
  Calendar calobj = Calendar.getInstance(); 
  System.out.println("first day of current week:"+ calobj.getFirstDayOfWeek());
  calobj.setFirstDayOfWeek(5);
  System.out.println("Date is " + calobj.getTime() +   " so first day of week  is " + calobj.getFirstDayOfWeek()); 
  calobj.setFirstDayOfWeek(Calendar.TUESDAY);
  System.out.println("Date is " + calobj.getTime() + "  then first day of week :" + calobj.getFirstDayOfWeek());
}
}

输出

first day of current week:1
Date is Wed Aug 15 17:57:56 PDT 2018 so first day of week  is 5
Date is Wed Aug 15 17:57:56 PDT 2018  then first day of week :3

示例 2

import java.util.Calendar;
import java.util.Locale;
public class JavaCalendarsetFirstDayOfWeekExample2 {
public static void main(String[] args) {
    Calendar mycal = Calendar.getInstance(new Locale("us"));
     mycal.setFirstDayOfWeek(3);
     int first = mycal.getFirstDayOfWeek();
     System.out.println(" First Day Of week is :" + mycal.getFirstDayOfWeek() );
    //checking 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();
     mycal.setFirstDayOfWeek(Calendar.YEAR);
    if ( first2 == Calendar.MONDAY) {
        System.out.println(" in uk local  First day of week is Monday  !!");
    }
}
}

输出

First Day Of week is :3
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 JavaCalendarSetFirstDayOfWeekExample3 {
    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());
      mycal.setFirstDayOfWeek(7);
      int firsD = mycal.getFirstDayOfWeek();
      switch(firsD) {
         case 1:
         case 2:
         case 3:
            System.out.println(" After changing First Day of Week can be following : Monday , Tuesday , wednasday");
            break;
         case 4:
         case 5:  
         case 6:
            System.out.println(" After changing First Day of Week can be following : Thirsday , Friday , saturday");
            break;
         case 7:
            System.out.println(" After changing First Day is Sunday");
            break;
      }
   }
}

输出

First day is :1
 After changing First Day is Sunday

下一主题Java-calendar-set-method

Java Calendar setFirstDayOfWeek() 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 setFirstDayOfWeek() 方法

语法

参数

返回值

抛出

示例 1

示例 2

示例 3

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