为什么还要导入WeekDay

Enumeration WeekDay

package ch20



object WeekDayDemo {
	object WeekDay extends Enumeration {
		type WeekDay = Value
		val Mon, Tue, Web, Thu, Fri, Sat, Sun = Value
	}
	
	//import WeekDay._
	
	def isWorkingDay(day: WeekDay) = !(day == WeekDay.Sat || day == WeekDay.Sun) 
	def main(args: Array[String]) {
		WeekDay.values filter isWorkingDay foreach println
	}
}

WeekDay和isWorkingDay都在同一个类里,为什么还要import?

经自由风指点,原来object是不能作为方法参数的类型的.
import WeekDay._的作用是引入object WeekDay中的所有成员包括WeekDay(Enumeration#Value),Mon,Tue ...
.