Java DayOfWeek minus()用法及代码示例

java.time.DayOfWeek的minus()方法是Java中的一个内置函数，该函数使用一个长整数作为参数，并在按传递的参数指定的前进或后退几天后返回DayOfWeek的实例。计算从星期一到星期日的一周结束时进行。指定的时间段可以是正数或负数。

方法声明：

public DayOfWeek minus(long days)

用法:

DayOfWeek dayOfWeekObject = dayOfWeekObject.minus(long days)

参数：此方法以天为参数，其中：

days–是前进或后退的天数。
dayOfWeekObject–是DayOfWeek对象的实例。

返回值：向后或向前前进几天后，该函数将返回DayOfWeek的实例。

以下示例程序旨在说明上述方法：
示例1:

// Java Program Demonstrate minus() 
// 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(2); 
  
        // Printing the day of the week and its Int value 
        System.out.println("Day of the Week : "
                           + dayOfWeek.name() + " - "
                           + dayOfWeek.getValue()); 
  
        // Number of days to advance 
        long adv = 10; 
  
        // Advancing the day 
        dayOfWeek = dayOfWeek.minus(adv); 
  
        // Printing the day of the week and its 
        // Int value before adv days 
        System.out.println("Day of the Week before "
                           + adv + " days: "
                           + dayOfWeek.name() + " - "
                           + dayOfWeek.getValue()); 
    } 
}

输出：

Day of the Week : TUESDAY - 2
Day of the Week before 10 days: SATURDAY - 6

示例2:

// Java Program Demonstrate minus() 
// 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() 
                           + " - "
                           + dayOfWeek.getValue()); 
  
        // Number of days to advance 
        long adv = -3; 
  
        // Advancing the day 
        dayOfWeek = dayOfWeek.minus(adv); 
  
        // Printing the day of the week and its 
        // Int value before adv days 
        System.out.println("Day of the Week before "
                           + adv + " days: "
                           + dayOfWeek.name() 
                           + " - "
                           + dayOfWeek.getValue()); 
    } 
}

输出：

Day of the Week : SUNDAY - 7
Day of the Week before -3 days: WEDNESDAY - 3

参考： https://docs.oracle.com/javase/8/docs/api/java/time/DayOfWeek.html#minus-long-

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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 minus() 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。