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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430
2
부
기본기 다지기
array2
[
2
]
=
new Double
(
3
.
14
);
//
문제없이
컴파일되지만
실행
시점에
오류가
발생한다
!
}
}
이 파일은 오류 없이 컴파일된다. 하지만 이를
SBT
에서 실행하면 우스운 일이 발생한다.
>
run
-
main progscala2
.
objectsystem
.
JavaArrays
[
info
]
Running progscala2
.
objectsystem
.
JavaArrays
[
error
]
(
run
-
main
-
4
)
java
.
lang
.
ArrayStoreException
:
java
.
lang
.
Double
java
.
lang
.
ArrayStoreException
:
java
.
lang
.
Double
at progscala2
.
objectsystem
.
JavaArrays
.
main
(
JavaArrays
.
java
:
10
)
...
무엇이 잘못된 것일까? 앞에서 변경 가능한 컬렉션이 안전하기 위해서는 타입 매개변수에 대해 무
공변이어야 한다고 이야기했다. 하지만 여기서는
Array
[
Integer
]
인스턴스를
Array
[
Number
]
참조에 대입하는 것이 컴파일러에 의해 허용된다. 따라서 컴파일러는
Number
를 배열의 원소에
대입하는 것이 가능하다고 생각한다. 하지만 실제로 배열은 자신이
Integer
만 받을 수 있다는
사실을 내부적으로 ‘안다’ (물론
Integer ...
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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.