시리즈

❮

[JAVA] String / StringBuilder / StringBuffer

20180417


String

immutable 하다. : 한번 만들어진 인스턴스는 바뀌지 않는다.
자바에서 immutable한 객체는 Thread safe하므로
String 역시 Thread safe하다.

자바에서 String 인스턴스는 Constant String Pool 에 저장되는데

String string = "abc";
string = "def";



이렇게 하면 "abc" "def" 라는 두 개의 인스턴스가 생성되고 "abc" 로 가는 레퍼런스는 잃게 된다.

(GC의 대상이됨)









StringBuilder



String과 달리 mutable 하다.

힙에 생성된다.

thread safe 하지 않다. 대신 속도가 빠르다


















StringBuffer

mutable하고

StringBuilder에서 사용가능한 메소드를 모두 사용할 수 있다.

모든 메소드가 synchronized 되어있어서 thread safe하다.

대신 속도가 느리다









자주 바뀌는 문자열이면 StringBuilder, 속도보다는 Thread safe가 중요한 상황에서는 StringBuffer.





















.












piano (press key Q)













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