Java中的 DayOfWeek get() 方法及示例

Java .time.DayOfWeek的get()方法是Java中的一个内置函数，它以TemporalField作为参数，并从该星期几获取指定字段的值作为 int。 TemporalField 是日期时间字段，例如月份或分钟。日期和时间使用此类字段表示。如果该字段为 DAY_OF_WEEK，则将返回从 1 到 7 的星期几的值。所有其他 ChronoField 实例将抛出 UnsupportedTemporalTypeException。 int 值遵循 ISO-8601 标准，从 1（星期一）到 7（星期日）。

方法声明：

public int get(TemporalField field);

句法：

int val = DayOfWeekObject.get(TemporalField field);

参数：此方法将字段作为参数，其中：

字段– 是一个时间字段，如 Chronafield.DAY_OF_WEEK。

DayOfWeekObject – 表示 DayOfWeek 对象。

参数：此方法不接受任何参数。

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

下面的程序说明了上述方法：
方案一：

// 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

方案二：

// 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： https: Java/time/DayOfWeek.html#get-java.time.temporal.TemporalField-