Java DayOfWeek from()用法及代码示例

java.time.DayOfWeek的from()方法是Java中的内置函数，该函数采用TemporalAccessor定义日期，并返回与该日期对应的DayOfWeek实例。 TemporalAccessor代表日期和时间信息的任意集合，该方法将其转换为与该日期相对应的DayOfWeek实例。

方法声明：

 public static DayOfWeek from(TemporalAccessor temporal)

用法:

 DayOfWeek dayOfWeekObject = DayOfWeek.from(TemporalAccessor temporal)

参数：此方法将时间作为参数，其中：

temporal – 是一个TemporalAccessor，它代表一个日期。
dayOfWeekObject – 是DayOfWeek的实例。

返回值：该函数返回DayOfWeek的一个实例，该实例与由temporal指定的日期相对应

以下示例程序旨在说明上述方法：
示例1:

// Java Program Demonstrate from() 
// method of DayOfWeek 
  
import java.time.*; 
import java.time.DayOfWeek; 
  
class DayOfWeekExample { 
    public static void main(String[] args) 
    { 
        // Set a local date whose day is found 
        LocalDate localDate 
            = LocalDate.of(1997, Month.AUGUST, 15); 
  
        // Initialize a DayOfWeek object 
        // with specified local Date 
        DayOfWeek dayOfWeek 
            = DayOfWeek.from(localDate); 
  
        // Printing the day of the week 
        System.out.println("Day of the Week on "
                           + localDate + " - "
                           + dayOfWeek.name()); 
    } 
}

输出：

Day of the Week on 1997-08-15 - FRIDAY

示例2:

// Java Program Demonstrate from() 
// method of DayOfWeek 
  
import java.time.*; 
  
class DayOfWeekExample { 
    public static void main(String[] args) 
    { 
        // Set a local date whose day is found 
        LocalDate localDate 
            = LocalDate.of(2015, Month.JULY, 13); 
  
        // Initialize a DayOfWeek object 
        // with specified local Date 
        DayOfWeek dayOfWeek 
            = DayOfWeek.from(localDate); 
  
        // Printing the day of the week 
        System.out.println("Day of the Week on "
                           + localDate + " - "
                           + dayOfWeek.name()); 
    } 
}

输出：

Day of the Week on 2015-07-13 - MONDAY

参考： https://docs.oracle.com/javase/8/docs/api/java/time/DayOfWeek.html#from-java.time.temporal.TemporalAccessor-

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注：本文由纯净天空筛选整理自rupesh_rao大神的英文原创作品 DayOfWeek from() method in Java with Examples。非经特殊声明，原始代码版权归原作者所有，本译文未经允许或授权，请勿转载或复制。