Java DayOfWeek get()方法及示例

java.time.DayOfWeek 的 get() 方法是Java中的一个内置函数，它接收一个 TemporalField 作为参数，并从这个星期的一天中获取指定字段的值作为一个int。TemporalField是一个日期-时间的字段，如年月日或小时分钟。日期和时间是用这种字段来表达的。如果字段是DAY_OF_WEEK，那么将返回从1到7的周天的值。所有其他ChronoField实例将抛出一个UnsupportedTemporalTypeException。int值遵循ISO-8601标准，从1（周一）到7（周日）。

方法声明 。

public int get(TemporalField field);

语法

int val = DayOfWeekObject.get(TemporalField field);

参数： 该方法接受field作为参数，其中。

• field – 是一个类似Chronafield.DAY_OF_WEEK的时间字段。
• DayOfWeekObject – 代表DayOfWeek对象。

参数。这个方法不接受任何参数。

返回值： 该函数返回星期的int值，例如，1代表星期一，2代表星期二，以此类推。

以下程序说明了上述方法：

程序1 :

// Java Program Demonstrate get()
// method of DayOfWeek
  
import java.time.*;
import java.time.DayOfWeek;
import java.time.temporal.ChronoField;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Set a local date whose day is found
        LocalDate localDate
            = LocalDate.of(1947,
                           Month.AUGUST, 15);
  
        // Find the day from the local date
        DayOfWeek dayOfWeek
            = DayOfWeek.from(localDate);
  
        // Printing the day of the week
        // and its Int value
        System.out.println("Day of the Week on "
                           + localDate + " - "
                           + dayOfWeek.name());
  
        int val
            = dayOfWeek.get(ChronoField.DAY_OF_WEEK);
  
        System.out.println("Int Value of "
                           + dayOfWeek.name()
                           + " - " + val);
    }
}

输出:

Day of the Week on 1947-08-15 - FRIDAY
Int Value of FRIDAY - 5

程序2

// Java Program Demonstrate get()
// method of DayOfWeek
import java.time.*;
import java.time.DayOfWeek;
import java.time.temporal.ChronoField;
  
class DayOfWeekExample {
    public static void main(String[] args)
    {
        // Set a local date whose day is found
        LocalDate localDate
            = LocalDate.of(2015,
                           Month.JULY, 13);
  
        // Find the day from the local date
        DayOfWeek dayOfWeek
            = DayOfWeek.from(localDate);
  
        // Printing the day of the week
        // and its Int value
        System.out.println("Day of the Week on "
                           + localDate + " - "
                           + dayOfWeek.name());
  
        int val
            = dayOfWeek.get(ChronoField.DAY_OF_WEEK);
  
        System.out.println("Int Value of "
                           + dayOfWeek.name()
                           + " - " + val);
    }
}

输出:

Day of the Week on 2015-07-13 - MONDAY
Int Value of MONDAY - 1

参考资料: https://docs.oracle.com/javase/8/docs/api/java/time/DayOfWeek.html#get-java.time.temporal.TemporalField-