Java 中的日历设置 FirstDayOfWeek()方法，带示例

原文:https://www . geesforgeks . org/calendar-setfirst dayofweek-method-in-Java-with-examples/

Calendar 类中的setfirst dayofweek(int day _ val)方法用于使用本 Calendar 中的 day_val 设置一周的第一天。

语法:

public void set(int *day_val*)

参数:该方法取整数类型的一个参数 day_val ，指一周的第一天。

返回值:该方法不返回值。

以下程序说明了日历类的 setFirstDayOfWeek()方法的工作: 示例 1:

// Java code to illustrate
// setFirstDayOfWeek() method

import java.util.*;

public class Calendar_Demo {
    public static void main(String args[])
    {

        // Creating calendar object
        Calendar calndr = Calendar.getInstance();

        // Displaying first day of the week
        int first_day = calndr.getFirstDayOfWeek();
        System.out.println("The Current"
                           + " First day of the week: "
                           + first_day);

        // Changing the first day of week
        calndr.setFirstDayOfWeek(Calendar.THURSDAY);

        // Displaying the alternate day
        first_day = calndr.getFirstDayOfWeek();
        System.out.println("The new first"
                           + " day of the week: "
                           + first_day);
    }
}

Output:

The Current First day of the week: 1
The new first day of the week: 5

例 2:

// Java code to illustrate
// setFirstDayOfWeek() method

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

        // Creating calendar object
        Calendar calndr
            = new GregorianCalendar(2018, 6, 10);

        // Displaying first day of the week
        int first_day = calndr.getFirstDayOfWeek();
        System.out.println("The"
                           + " First day of the week: "
                           + first_day);

        // Changing the first day of week
        calndr.setFirstDayOfWeek(Calendar.MONDAY);

        // Displaying the alternate day
        first_day = calndr.getFirstDayOfWeek();
        System.out.println("The new first"
                           + " day of the week: "
                           + first_day);
    }
}

Output:

The First day of the week: 1
The new first day of the week: 2

参考:https://docs . Oracle . com/javase/8/docs/API/Java/util/calendar . html # setfirst dayofweek-int-

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