Java DayOfWeek get()用法及代碼示例

java.time.DayOfWeek的get()方法是Java中的一個內置函數，它以TemporalField作為參數，並從此day-of-week中獲取指定字段的值作為int。 TemporalField是日期時間字段，例如month-of-year或hour-of-minute。日期和時間使用此類字段表示。如果該字段是DAY_OF_WEEK，則將返回day-of-week的值(從1到7)。所有其他ChronoField實例將引發UnsupportedTemporalTypeException。 int值遵循ISO-8601標準，從1(星期一)到7(星期日)。

方法聲明：

public int get(TemporalField field);

用法:

int val = DayOfWeekObject.get(TemporalField field);

參數：此方法將field作為參數，其中：

field –是類似Chronafield.DAY_OF_WEEK的時間字段。
DayOfWeekObject–表示DayOfWeek對象。

參數：此方法不接受任何參數。

返回值：該函數返回星期幾的int值，例如，星期一為1，星期二為2，依此類推。

以下示例程序旨在說明上述方法：
示例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); 
    } 
}

輸出：

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

示例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); 
    } 
}

輸出：

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

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

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注：本文由純淨天空篩選整理自rupesh_rao大神的英文原創作品 DayOfWeek get() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。