快學Scala習題解答 第六章 物件

object

conversions
defgallonstoliters(){}
defmilestokilometers(){}
}

abstract

class
unitconversion
defgallonstoliters(){}
defmilestokilometers(){}
}object
inchestocentimeters
extends
unitconversion
}object
gallonstoliters
extends
unitconversion
}object
milestokilometers
extends
unitconversion
}

point中的getlocation方法返回的是point物件，如果想返回origin物件，需要origin類才行

object

origin
extends
point
with
override
defgetlocation: point = super.getlocation
origin.move(2,3)
println(origin.tostring)
}

class

point(x:int,y:int)
object
point
extends
defnew point(x,y)
}  val
p = point(1,2)
println(p)
}

object

reverse
extends
args.reverse.foreach(arg => print(arg  + " "))
}

object

card
extends
enumeration
with
valm = value("♣")
valt = value("♠")
valh = value("♥")
valf = value("♦")
println(card.m)
println(card.t)
println(card.h)
println(card.f)
}

object

card
extends
enumeration
with
valm = value("♣")
valt = value("♠")
valh = value("♥")
valf = value("♦")
defcolor(c:card.value)
color(card.h)
}

object

rgbextends
enumeration
with
valred = value(0xff0000,"red")
valblack = value(0x000000,"black")
valgreen = value(0x00ff00,"green")
valcyan = value(0x00ffff,"cyan")
valyellow = value(0xffff00,"yellow")
valwhite = value(0xffffff,"white")
valblue = value(0x0000ff,"blue")
valmagenta = value(0xff00ff,"magenta")
}

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《快學Scala》第六章習題解答

rt。package com.scalalearn.scala.main 快學scala 06習題 1.編寫乙個conversions物件，加入inchestocentimeters,gallonstoliters和milestokilometers方法 object conversions def...

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