July 2016
Beginner to intermediate
776 pages
17h 26m
Korean
Content preview from 프로그래밍 스칼라: 실용적인 스칼라 활용법을 익히는 가장 확실한 실전 바이블 (2.11.x 버전 기반)
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377
8
장
스칼라 객체지향 프로그래밍
예를 들어 다음 메서드에
USPhoneNumber
를 넘기는 경우에는 반드시 인스턴스를 할당해야 한다.
def toDigits
(
d
:
Digitizer
,
str
:
String
)
=
d
.
digits
(
str
)
...
val digs
=
toDigits
(
new USPhoneNumber
("
987
-
654
-
3210
"),
"
123
-
Hello
!
-
456
")
//
결과
:
digs
:
String
=
123456
또한 다음 매개변수화한 메서드에
USPhoneNumber
를 넘기는 경우
USPhoneNumber
의 인스턴스
를 할당해야 한다.
def print
[
T
](
t
:
T
)
=
println
(
t
.
toString
)
print
(
new USPhoneNumber
("
987
-
654
-
3210
"))
//
결과
:
(
987
)
654
-
3210
요약하면, 값 클래스는 부가 비용을 적게 쓰면서 확장 클래스 (타입 클래스)를 정의하거나, 어
떤 분야에서 의미 있는 이름을 타입에 부여 (예를 들면
Dollar
)할 수 있는 방법이다.
NOTE
_
값 타입이라는 용어는 스칼라에 오랫동안 있었던
Short
,
Int
,
Long
,
Float
,
Double
,
Boolean
,
Char
,
Byte
,
Unit
타입을 가리킨다. 값 클래스는
AnyVal
로부터 파생된 클래스를 정의할 수 있는 새로운 스
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.