August 2024
Beginner to intermediate
488 pages
11h 1m
Korean
Content preview from 실무로 통하는 클린 코드
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284
실무로 통하는 클린 코드
15.4
실제 객체로
null
대체하기
문제
실제로 존재하는
null
객체를 만들어야 합니다.
해결
null
객체 패턴을 포함한 디자인 패턴을 남용하지 마세요. 전단사에서 실제
null
객체
를 찾아서 이러한 객체를 대신 생성하세요.
설명
null
객체 패턴 (
15
.
1
절 ‘
null
객체 생성하기’ 참조 )을 과용하면 빈 클래스가 생성되고
네임스페이스가 오염되며 (
18
.
4
절 ‘전역 클래스 제거하기’ 참조 ) 중복된 동작이 발생할 수 있습
니다.
null
객체를 생성할 때 실제 객체 클래스를 인스턴스화해 사용할 수 있습니다.
null
객
체 패턴은
null
과
if
에 대한 훌륭한 대안이며, 패턴의 구조는 계층을 생성하도록 유도합니다.
그러나 반드시 필수인 것은 아닙니다. 그 대신 실제 객체가
null
객체에 대해 다형성을 유지해
야 합니다. 상속이 다형성을 달성하는 유일한 방법은 아닙니다 (
14
.
4
절 ‘
switch
/
case
/
else
if
문 대체하기’ 참조 ). 간단한 해결책은 실제 객체가
null
객체처럼 작동하도록 만드는 것입니
다. [표
15
-
1
]에는 몇 가지 친숙한
null
객체가 있습니다.
표
15-1
익숙한
null
객체
클래스
null
객체
숫자
0
문자열
""
배열
[]
다음 예제는
NullAddress
를 생성합니다.
abstract class ...
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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.