Java DayOfWeek of()方法及示例

java.time.DayOfWeek 的 of() 方法是Java中的一个内置函数，它从一个int值返回一个DayOfWeek的实例。该int值的范围在1（星期一）到7（星期日）之间。

方法声明 。

public static DayOfWeek of(int dayOfWeek)

语法

DayOfWeek dayOfWeekObject = DayOfWeek.of(int dayOfWeek)

参数： 该方法以dayOfWeek为参数，其中。

• dayOfWeek – 是从1（星期一）到7（星期日）的int值。
• dayOfWeekObject – 是DayOfWeek对象的一个实例。

返回值： 该函数返回DayOfWeek对象的一个实例。

以下程序说明了上述方法：

程序 1 :

// Java Program Demonstrate of()
// method of DayOfWeek
import java.time.DayOfWeek;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Getting an instance of DayOfWeek from int value
        DayOfWeek dayOfWeek = DayOfWeek.of(4);
  
        // Printing the day of the week
        // and its Int value
        System.out.println("Day of the Week - "
                           + dayOfWeek.name());
        System.out.println("Int Value of "
                           + dayOfWeek.name() + " - "
                           + dayOfWeek.getValue());
    }
}

输出:

Day of the Week - THURSDAY
Int Value of THURSDAY - 4

程序2

// Java Program Demonstrate of()
// method of DayOfWeek
import java.time.DayOfWeek;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Getting an instance of DayOfWeek from int value
        DayOfWeek dayOfWeek = DayOfWeek.of(7);
  
        // Printing the day of the week
        // and its Int value
        System.out.println("Day of the Week - "
                           + dayOfWeek.name());
        System.out.println("Int Value of "
                           + dayOfWeek.name() + " - "
                           + dayOfWeek.getValue());
    }
}

输出:

Day of the Week - SUNDAY
Int Value of SUNDAY - 7

参考资料: https://docs.oracle.com/javase/8/docs/api/java/time/DayOfWeek.html#of-int-