๐Ÿ“š
TIL
  • README
  • Git
    • Basic
    • Remote Repository
    • Log & Diff
    • Rebase&Cherri-Pick
    • git-flow
  • DevOps
    • Monolithic vs MSA
    • Jenkins ์‹œ์ž‘ํ•˜๊ธฐ
    • Airflow ์‹œ์ž‘ํ•˜๊ธฐ
    • Airflow ์‹œ์ž‘ํ•˜๊ธฐ
    • Build Tools
      • maven
  • ๊ฐœ๋ฐœ ๋ฐฉ๋ฒ•๋ก 
    • TDD
  • Spring
    • IoC
    • Is Spring Bean Thread-Safe?
    • Spring Singleton
    • Component Scan
    • Spring Annotation
    • ์˜์กด ๊ด€๊ณ„ ์ฃผ์ž…(DI)
    • Lombok ํ™œ์šฉํ•˜๊ธฐ
    • Bean ์ƒ๋ช…์ฃผ๊ธฐ์™€ ์ฝœ๋ฐฑ
    • Bean Scope
    • AOP(1) - AOP๋ž€
    • AOP(2) - Aop Proxy
    • AOP(3) - Dynamic Proxy
    • AOP(4) - AspectJ
    • POJO
    • Spring ์„œ๋น„์Šค ๊ตฌ์กฐ
    • Transaction
    • JPA๋ž€?
    • JPA Entity
    • Spring Data JPA
    • Spring Data Specification
    • Model Mapping
    • Cache
    • restTemplate
    • YAML ํŒŒ์ผ ์„ค์ •
    • Spring Boot
      • H2 DB ์„ค์ •
      • ๋‹ค์ค‘ ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์„ค์ •
      • Mybatis ์—ฐ๋™ํ•˜๊ธฐ
    • Spring Batch
      • Batch ์‹œ์ž‘ํ•ด๋ณด๊ธฐ
      • Batch Job Flow
      • Job
      • Step
      • Batch Scope & Job Parameter
      • JobRepository์™€ ๋ฉ”ํƒ€ํ…Œ์ด๋ธ”
      • Chunk ์ง€ํ–ฅ ํ”„๋กœ๊ทธ๋ž˜๋ฐ
      • ItemReader
      • ItemProcessor
      • ItemWriter
      • Batch Schedular
      • Job๋ณ„ Bean๋“ฑ๋กํ•˜๊ธฐ
      • Batch ๊ตฌํ˜„์‹œ ๋ฐœ์ƒํ•œ ์˜ค๋ฅ˜ ์ •๋ฆฌ
      • Spring Batch Scaling
        • Multithread Job๊ตฌํ˜„์‹œ ์ด์Šˆ์‚ฌํ•ญ
    • Spring test
      • Junit5
        • ํ…Œ์ŠคํŠธ ์ด๋ฆ„ ํ‘œ๊ธฐ
        • ํ…Œ์ŠคํŠธ ๊ทธ๋ฃน ์‚ฌ์ด์˜ ๊ด€๊ณ„
        • ํƒœ๊ทธ์™€ ํ•„ํ„ฐ๋ง
        • ๋™์  ํ…Œ์ŠคํŠธ
        • ํ…Œ์ŠคํŠธ LifeCycle
        • ํ…Œ์ŠคํŠธ ๋ฉ”์„œ๋“œ
        • ํ…Œ์ŠคํŠธ ์ˆœ์„œ
        • AssertJ
        • ํ…Œ์ŠคํŠธ ๋ณ‘๋ ฌ ์‹คํ–‰
        • AssertJ
        • Mock
      • Spring Boot Test DB ๋ถ„๋ฆฌ
      • Spring Batch Test
  • Web Application
    • Web Server & WAS
    • ๊ด€๋ จ ๊ฐœ๋… - HTTP API, HTML, CSR, SSR
    • Servlet
    • JSP
    • Cookie And Session
    • ์˜ˆ์™ธํŽ˜์ด์ง€
    • Java Bean
    • JDBC
    • Connection Pool
    • ํŒŒ์ผ ์—…๋กœ๋“œ
    • Expression Language
    • JSTL
    • FrontControllerํŒจํ„ด Command ํŒจํ„ด
    • Forwarding
    • MVC
    • ํšŒ์›๊ฐ€์ž…์˜ˆ์ œ
    • ์ฐธ๊ณ 
      • ๊ฐœ๋ฐœํ™˜๊ฒฝ์„ค์ •
  • Java+
    • SOAP/WSDL vs REST
    • WSDL์„ JAVA๋กœ ๋ณ€ํ™˜ํ•˜๊ธฐ
    • SOAP ํ†ต์‹  OPEN API๋กœ ๊ฐœ๋ฐœํ•ด๋ณด๊ธฐ
  • Java
    • Basic
      • ๋ณ€์ˆ˜์™€ ํƒ€์ž…
      • ์—ฐ์‚ฐ์ž
      • ์กฐ๊ฑด๋ฌธ๊ณผ ๋ฐ˜๋ณต๋ฌธ
      • ์ฐธ์กฐ ํƒ€์ž…
      • ํด๋ž˜์Šค
      • ์ƒ์†(Inheritance)
      • ์ธํ„ฐํŽ˜์ด์Šค(Interface)
      • ์ค‘์ฒฉ ํด๋ž˜์Šค์™€ ์ค‘์ฒฉ ์ธํ„ฐํŽ˜์ด์Šค
      • ์˜ˆ์™ธ ์ฒ˜๋ฆฌ
      • API - Object, System, Class, Math, Wrapper
      • API - String, StringBuffer, StringBuilder
      • Thread
      • Generic
      • Lambda
      • Collection - List, Set
      • Collection - Map
      • Collection - Tree
      • Collection - Stack, Queue
      • Stream
      • Reflection
      • ์ •๊ทœํ‘œํ˜„์‹
      • GUI
      • UML
      • Serializable
    • Advanced
      • OutOfMemoryError
      • AutoValue
      • meta-annotation
        • @Retention
        • @Target
        • @Repeatable
    • Effective Java 3/E
      • ITEM 1: Static Factory Method(์ •์  ๋ฉ”์†Œ๋“œ)
      • ITEM 2: Builder Pattern
      • ITEM 3: Singleton
      • ITEM 4: Private Constructor
      • ITEM 5: Dependency Injection
      • ITEM 6: Avoid Unnecessary Object
      • ITEM 7: Eliminate Object Reference
      • ITEM 8: Avoid finalizer and cleaner
      • ITEM 9: try-with-resources
      • ITEM 10: The gerneral contract when overriding equlas
      • ITEM 11: Overriding hashCode
      • ITEM 12: overriding toString
      • ITEM 13: overriding clone judiciously
      • ITEM 14: Consider implementing comparable
      • ITEM 15: ํด๋ž˜์Šค์™€ ๋ฉค๋ฒ„์˜ ์ ‘๊ทผ์„ ์ตœ์†Œํ™”ํ•ด๋ผ
      • ITEM 16: Use Accessor methods
      • ITEM 17: ๋ณ€๊ฒฝ ๊ฐ€๋Šฅ์„ฑ์„ ์ตœ์†Œํ™”ํ•ด๋ผ(๋ถˆ๋ณ€ ํด๋ž˜์Šค)
      • ITEM 18: ์ƒ์†๋ณด๋‹จ ์ปดํฌ์ง€์…˜์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 19: ์ƒ์†์„ ๊ณ ๋ คํ•ด ์„ค๊ณ„ํ•˜๊ณ  ๋ฌธ์„œํ™”ํ•ด๋ผ
      • ITEM 20: ์ถ”์ƒ ํด๋ž˜์Šค๋ณด๋‹ค ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์šฐ์„ ํ•˜๋ผ
      • ITEM 21: ์ธํ„ฐํŽ˜์ด์Šค๋Š” ๊ตฌํ˜„ํ•˜๋Š” ์ชฝ์„ ์ƒ๊ฐํ•ด ์„ค๊ณ„ํ•ด๋ผ.
      • ITEM 22: ์ธํ„ฐํŽ˜์ด์Šค๋Š” ํƒ€์ž…์„ ์ •์˜ํ•˜๋Š” ์šฉ๋„๋กœ๋งŒ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 23: ํƒœ๊ทธ ๋‹ฌ๋ฆฐ ํด๋ž˜์Šค๋ณด๋‹ค ํด๋ž˜์Šค ๊ณ„์ธต๊ตฌ์กฐ๋ฅผ ํ™œ์šฉํ•ด๋ผ
      • ITEM 24: ๋ฉค๋ฒ„ ํด๋ž˜์Šค๋Š” ๋˜๋„๋ก static์œผ๋กœ ๊ตฌํ˜„ํ•ด๋ผ
      • ITEM 25: ํ†ฑ๋ ˆ๋ฒจ ํด๋ž˜์Šค๋Š” ํ•œ ํŒŒ์ผ์— ํ•˜๋‚˜๋งŒ ์ƒ์„ฑํ•ด๋ผ.
      • ITEM 26: Raw type์€ ์‚ฌ์šฉํ•˜์ง€ ๋งˆ๋ผ
      • ITEM 27: ๋น„๊ฒ€์‚ฌ ๊ฒฝ๊ณ ๋ฅผ ์ œ๊ฑฐํ•ด๋ผ
      • ITEM 28: ๋ฐฐ์—ด๋ณด๋‹ค๋Š” ๋ฆฌ์ŠคํŠธ๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 29: ์ด์™•์ด๋ฉด ์ œ๋„ค๋ฆญ ํƒ€์ž…์œผ๋กœ ๋งŒ๋“ค์–ด๋ผ
      • ITEM 30: ์ด์™•์ด๋ฉด ์ œ๋„ค๋ฆญ ๋ฉ”์„œ๋“œ๋กœ ๋งŒ๋“ค์–ด๋ผ
      • ITEM 31 : ํ•œ์ •์  ์™€์ผ๋“œ์นด๋“œ๋ฅผ ์‚ฌ์šฉํ•ด API ์œ ์—ฐ์„ฑ์„ ๋†’์—ฌ๋ผ
      • ITEM 32: ์ œ๋„ค๋ฆญ๊ณผ ๊ฐ€๋ณ€์ธ์ˆ˜๋ฅผ ํ•จ๊ป˜ ์“ธ ๋•Œ๋Š” ์‹ ์ค‘ํ•ด๋ผ
      • ITEM 33: ํƒ€์ž… ์•ˆ์ „ ์ด์ข… ์ปจํ…Œ์ด๋„ˆ๋ฅผ ๊ณ ๋ คํ•ด๋ผ
      • ITEM 34: int ์ƒ์ˆ˜ ๋Œ€์‹  ์—ด๊ฑฐ ํƒ€์ž…์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 35: ordinal ๋ฉ”์„œ๋“œ ๋Œ€์‹  ์ธ์Šคํ„ด์Šค ํ•„๋“œ๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 36: ๋น„ํŠธ ํ•„๋“œ ๋Œ€์‹  EnumSet์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 37: ordinal ์ธ๋ฑ์‹ฑ ๋Œ€์‹  EnumMap์„ ์‚ฌ์šฉํ•ด๋ผ
      • TEM 38 : ํ™•์žฅํ•  ์ˆ˜ ์žˆ๋Š” ์—ด๊ฑฐํƒ€์ž…์ด ํ•„์š”ํ•˜๋ฉด ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 39: ๋ช…๋ช… ํŒจํ„ด๋ณด๋‹ค ์• ๋„ˆํ…Œ์ด์…˜์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 40: @Override ์–ด๋…ธํ…Œ์ด์…˜์„ ์ผ๊ด€๋˜๊ฒŒ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 41: ์ •์˜ํ•˜๋ ค๋Š” ๊ฒƒ์ด ํƒ€์ž…์ด๋ผ๋ฉด ๋งˆ์ปค ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 42: ์ต๋ช… ํด๋ž˜์Šค๋ณด๋‹ค๋Š” ๋žŒ๋‹ค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 43: ๋žŒ๋‹ค๋ณด๋‹ค๋Š” ๋ฉ”์„œ๋“œ ์ฐธ์กฐ๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 44: ํ‘œ์ค€ ํ•จ์ˆ˜ํ˜• ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 45: ์ŠคํŠธ๋ฆผ์€ ์ฃผ์˜ํ•ด์„œ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 46: ์ŠคํŠธ๋ฆผ์—์„œ ๋ถ€์ž‘์šฉ ์—†๋Š” ํ•จ์ˆ˜๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 47: ๋ฐ˜ํ™˜ ํƒ€์ž…์œผ๋กœ๋Š” ์ŠคํŠธ๋ฆผ๋ณด๋‹ค ์ปฌ๋ ‰์…˜์ด ๋‚ซ๋‹ค.
      • ITEM 48: ์ŠคํŠธ๋ฆผ ๋ณ‘๋ ฌํ™”๋Š” ์ฃผ์˜ํ•ด์„œ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 49: ๋งค๊ฐœ๋ณ€์ˆ˜๊ฐ€ ์œ ํšจํ•œ์ง€ ๊ฒ€์‚ฌํ•ด๋ผ
      • ITEM 50: ์ ์‹œ์— ๋ฐฉ์–ด์  ๋ณต์‚ฌ๋ณธ์„ ๋งŒ๋“ค์–ด๋ผ
      • ITEM 51: ๋ฉ”์„œ๋“œ ์‹œ๊ทธ๋‹ˆ์ฒ˜๋ฅผ ์‹ ์ค‘ํžˆ ์„ค๊ณ„ํ•ด๋ผ
      • ITEM 52: ๋‹ค์ค‘์ •์˜๋Š” ์‹ ์ค‘ํžˆ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 53: ๊ฐ€๋ณ€์ธ์ˆ˜๋Š” ์‹ ์ค‘ํžˆ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 54: null์ด ์•„๋‹Œ, ๋นˆ ์ปฌ๋ ‰์…˜์ด๋‚˜ ๋ฐฐ์—ด์„ ๋ฐ˜ํ™˜ํ•ด๋ผ
      • ITEM 55: Optional ๋ฐ˜ํ™˜์€ ์‹ ์ค‘ํ•˜๊ฒŒ ํ•ด๋ผ
      • ITEM 56: ๊ณต๊ฐœ๋œ API ์š”์†Œ์—๋Š” ํ•ญ์ƒ ์ฃผ์„์„ ์ž‘์„ฑํ•ด๋ผ
      • ITEM 57: ์ง€์—ญ๋ณ€์ˆ˜์˜ ๋ฒ”์œ„๋ฅผ ์ตœ์†Œํ™”ํ•ด๋ผ
      • ITEM 58: ์ „ํ†ต์ ์ธ for ๋ฌธ๋ณด๋‹ค๋Š” for-each๋ฌธ์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 59: ๋ผ์ด๋ธŒ๋Ÿฌ๋ฆฌ๋ฅผ ์ตํžˆ๊ณ  ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 60: ์ •ํ™•ํ•œ ๋‹ต์ด ํ•„์š”ํ•˜๋‹ค๋ฉด float์™€ double์€ ํ”ผํ•ด๋ผ
      • ITEM 61: ๋ฐ•์‹ฑ๋œ ๊ธฐ๋ณธ ํƒ€์ž…๋ณด๋‹ค๋Š” ๊ธฐ๋ณธ ํƒ€์ž…์„ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 62: ๋‹ค๋ฅธ ํƒ€์ž…์ด ์ ์ ˆํ•˜๋‹ค๋ฉด ๋ฌธ์ž์—ด ์‚ฌ์šฉ์„ ํ”ผํ•ด๋ผ
      • ITEM 63: ๋ฌธ์ž์—ด ์—ฐ๊ฒฐ์€ ๋А๋ฆฌ๋‹ˆ ์ฃผ์˜ํ•ด๋ผ
      • ITEM 64: ๊ฐ์ฒด๋Š” ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด ์ฐธ์กฐํ•ด๋ผ
      • ITEM 65: ๋ฆฌํ”Œ๋ ‰์…˜๋ณด๋‹ค๋Š” ์ธํ„ฐํŽ˜์ด์Šค๋ฅผ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 66: ๋„ค์ดํ‹ฐ๋ธŒ ๋ฉ”์„œ๋“œ๋Š” ์‹ ์ค‘ํžˆ ์‚ฌ์šฉํ•ด๋ผ
      • ITEM 67: ์ตœ์ ํ™”๋Š” ์‹ ์ค‘ํžˆ ํ•ด๋ผ
      • ITEM 68: ์ผ๋ฐ˜์ ์œผ๋กœ ํ†ต์šฉ๋˜๋Š” ๋ช…๋ช… ๊ทœ์น™์„ ๋”ฐ๋ผ๋ผ
    • ๊ฐ์ฒด์ง€ํ–ฅ ์„ค๊ณ„ ์›์น™(SOLID)
    • ๋””์ž์ธํŒจํ„ด
      • Strategy Pattern
      • Template Method Pattern
      • Factory Method Pattern
      • Singleton
      • Delegation
      • Proxy
      • Adapter Pattern
    • ์‹ค์Šต
      • ์ธํ„ฐํŽ˜์ด์Šค ์‹ค์Šต - Vehicle
      • ์ธํ„ฐํŽ˜์ด์Šค ์‹ค์Šต - Remote
      • GUI ์‹ค์Šต - Calculator
      • GUI ์‹ค์Šต - button
      • GUI ์‹ค์Šต - lotto
      • Thread ์‹ค์Šต - ์ขŒ์„์˜ˆ์•ฝ, ๋ฉ”์„ธ์ง€๋ณด๋‚ด๊ธฐ
    • Jar vs War
  • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค
    • KEY
    • Index
    • Transaction
    • Trigger
    • Procedure / Function
    • Package
    • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ๋ฐฐ์›€ํ„ฐ
      • ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์‹œ์Šคํ…œ
      • ๊ด€๊ณ„๋ฐ์ดํ„ฐ ๋ชจ๋ธ
      • ๊ด€๊ณ„๋Œ€์ˆ˜์™€ SQL
    • MySQL
      • Database๋ž€
      • MySQL ์‹œ์ž‘ํ•˜๊ธฐ
      • MySQL Database
      • MySQL Table
      • CRUD
      • ๊ด€๊ณ„ํ˜• ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค
      • Server์™€ Client
    • PostgreSQL
    • NoSQL
      • Install Cassandra on mac
      • Cassandra๋ž€?
      • NiFi๋ž€
  • Algorithm
    • String
    • Recursion
    • Dynamic Programming
    • Array, Struct, Pointer
    • Math
    • Sort
    • List
    • Stack
    • Queue
    • Graph
    • Tree
    • Maze
    • AVL
    • ์ด์ง„ํƒ์ƒ‰ํŠธ๋ฆฌ(Binary Search Tree)
    • DFS์™€ BFS
    • ๋‹ค์ต์ŠคํŠธ๋ผ ์•Œ๊ณ ๋ฆฌ์ฆ˜(Dijkstra's Algorithm)
    • Red-Black ํŠธ๋ฆฌ
    • A* ์•Œ๊ณ ๋ฆฌ์ฆ˜
    • Heap
    • Huffman Coding
    • Priority Queue
    • Bellman-Ford ์•Œ๊ณ ๋ฆฌ์ฆ˜
    • C++
      • Class
      • STL
        • STL pair
        • STL Container - Associate Container
        • STL Container - Sequence Container
        • STL Container - Container Adapter
  • JavaScript
    • JABASCRIPT BASIC
    • Shallow Copy vs Deep Copy
    • OBJECT MODEL
    • NODE
    • ๋™๊ธฐ ์ฒ˜๋ฆฌ vs ๋น„๋™๊ธฐ ์ฒ˜๋ฆฌ
    • AJAX
    • CALLBACK
    • PROMISE
    • DEFERRER
    • UNDERSCORE
    • WEBPACK
    • SCOPE
    • EXECUTION CONTEXT
    • Image Object
    • BFCache๋ž€?
    • history.scrollRestoration
    • Intersection Observer
    • JWT - JSON Web Token
    • HTML vs JSON
  • Vue.js
    • ํ™˜๊ฒฝ์„ค์ •
    • Vue.js๋ž€?
    • Vue Instance
    • Vue Component
    • Vue Router
    • HTTP ํ†ต์‹ 
    • Template
    • Single File Component
    • Vue Animation
    • Vuex
    • Djnago์™€ ์—ฐ๋™ํ•˜๊ธฐ
  • Backbone.js
    • Model
    • Collection
    • Sync
    • view
  • Node.js
    • Doit! - ๋…ธ๋“œ๋กœ ๋งŒ๋“ค ์ˆ˜ ์žˆ๋Š” ๋Œ€ํ‘œ์ ์ธ ์„œ๋ฒ„์™€ ์šฉ๋„
    • Doit! - ๋…ธ๋“œ์— ๋Œ€ํ•ด ์•Œ์•„๋ณด๊ณ  ๊ฐœ๋ฐœ ๋„๊ตฌ ์„ค์น˜ํ•˜๊ธฐ
    • Doit! - ๋…ธ๋“œ ๊ฐ„๋‹จํ•˜๊ฒŒ ์‚ดํŽด๋ณด๊ธฐ
    • Doit! - ๋…ธ๋“œ์˜ ์ž๋ฐ”์Šคํฌ๋ฆฝํŠธ์™€ ์นœํ•ด์ง€๊ธฐ
    • Doit! - ๋…ธ๋“œ์˜ ๊ธฐ๋ณธ ๊ธฐ๋Šฅ ์•Œ์•„๋ณด๊ธฐ
    • Doit! - ์›น ์„œ๋ฒ„ ๋งŒ๋“ค๊ธฐ
    • Doit! - ๋ฐ์ดํ„ฐ๋ฒ ์ด์Šค ์‚ฌ์šฉํ•˜๊ธฐ
    • Doit! - ์ต์Šคํ”„๋ ˆ์Šค ํ”„๋กœ์ ํŠธ๋ฅผ ๋ชจ๋“ˆํ™”ํ•˜๊ธฐ
    • Doit! - ๋ทฐ ํ…œํ”Œ๋ฆฟ ์ ์šฉํ•˜๊ธฐ
    • Doit! - ํŒจ์ŠคํฌํŠธ๋กœ ์‚ฌ์šฉ์ž ์ธ์ฆํ•˜๊ธฐ
    • Doit! - ์ฑ„ํŒ…์„œ๋ฒ„ ๋งŒ๋“ค๊ธฐ
    • Doit! - JSON-RPC ์„œ๋ฒ„ ๋งŒ๋“ค๊ธฐ
  • Python
    • Warning-Could not import the lzma module
    • Pandas
      • Pandas ์ž๋ฃŒ๊ตฌ์กฐ
      • Pandas ๋ฐ์ดํ„ฐ ์ž…์ถœ๋ ฅ
      • DataFrame Data ์‚ดํŽด๋ณด๊ธฐ
      • ์‹œ๊ฐํ™” ๋„๊ตฌ - Matplotlib
  • ML
    • ์ถ”์ฒœ ์‹œ์Šคํ…œ
      • Collaborative Filtering
      • Matrix Factorization
  • Django
    • Basic
      • ํ™˜๊ฒฝ์„ค์ •
      • About Django
      • Start Django Project
      • Secret Key ๊ด€๋ฆฌํ•˜๊ธฐ
      • Settings ๋ถ„๋ฆฌํ•˜๊ธฐ
      • Django App
      • Django View & URL (1)
      • Django Model
        • MySQL ์—ฐ๋™
      • Django Admin
      • Django View & URL (2)
      • Django Template
      • Django Template & View & URL
      • Django Static
      • Django form
    • Advanced
      • Django Generic View
      • Django Automated Testing
      • Django Extenstion Template
      • Django Model Package
      • Django OpenSSL setting
    • REST framework
      • Rest API
      • Serializers
      • ViewSet
    • Error
      • ํ™˜๊ฒฝ์„ค์ • zlib ์˜ค๋ฅ˜๋ฐœ์ƒ
      • ModuleNotFoundError
    • ํŒจํ‚ค์ง€
      • django-debug-toolbar
    • Vue.js ์—ฐ๋™ํ•˜๊ธฐ
  • Ruby
    • variable & input/output
    • ์กฐ๊ฑด๋ฌธ
    • ๋ฐ˜๋ณต๋ฌธ
    • Array & Hash
    • Method
    • Proc&Lamda
    • Class
  • Ruby on Rails
    • Scaffolding
    • Controller
    • Model
    • Model-M:N relation
    • Model Validation
    • ๋ฉ‹์‚ฌ 10์ฃผ์ฐจ ์ˆ˜์—…(Tip)
  • HTML/CSS
    • Udacity - Intro to HTML/CSS
    • Udacity - Responsive Web Design
    • Udacity - Responsive Images
    • HTML Basic
    • CSS Basic
    • HTML5 Sementic Tag
    • HTML ํ…์ŠคํŠธ ๊ด€๋ จ ํƒœ๊ทธ๋“ค
    • HTML5 ๋ฉ€ํ‹ฐ๋ฏธ๋””์–ด
    • HTML ํผ ๊ด€๋ จ ํƒœ๊ทธ๋“ค
    • ํ…์ŠคํŠธ ๊ด€๋ จ ์Šคํƒ€์ผ
    • ์ƒ‰์ƒ๊ณผ ๋ฐฐ๊ฒฝ์„ ์œ„ํ•œ ์Šคํƒ€์ผ
    • ๋ ˆ์ด์•„์›ƒ์„ ์œ„ํ•œ ์Šคํƒ€์ผ
    • CSS ํฌ์ง€์…”๋‹
    • ๋‹ค์žฌ๋‹ค๋Šฅํ•œ CSS3 ์„ ํƒ์ž
    • CSS์™€ ์• ๋‹ˆ๋ฉ”์ด์…˜
    • ๋ฐ˜์‘ํ˜• ์›น์ด๋ž€?
  • OS(์šด์˜์ฒด์ œ)
    • Linux
      • Daemon
      • Cron
      • ํ”„๋กœ์„ธ์Šค ๊ด€๋ จ ๋ช…๋ น์–ด
      • ํ…์ŠคํŠธ ํŒŒ์ผ ๋ช…๋ น์–ด
  • Network
    • ๋„คํŠธ์›Œํฌ ๊ธฐ๋ณธ ๊ฐœ๋…
    • ๋„คํŠธ์›Œํฌ ๊ธฐ๋ณธ ๊ทœ์น™
    • ๋ฌผ๋ฆฌ ๊ณ„์ธต
    • ๋ฐ์ดํ„ฐ ๋งํฌ ๊ณ„์ธต
    • ๋„คํŠธ์›Œํฌ ๊ณ„์ธต
    • ์ „์†ก ๊ณ„์ธต
    • ์‘์šฉ ๊ณ„์ธต
    • ๋„คํŠธ์›Œํฌ ์ „์ฒด ํ๋ฆ„
    • ๋ฌด์„  ๋žœ
  • IT ๊ธฐํƒ€์ง€์‹
    • NAS๋ž€
Powered by GitBook
On this page
  • String ํด๋ž˜์Šค
  • ์‚ฌ์šฉ ๋นˆ๋„๊ฐ€ ๋†’์€ ์ƒ์„ฑ์ž
  • ๋ฌธ์ž์ถ”์ถœ(charAt())
  • ๋ฌธ์ž์—ด ๋น„๊ต(equals())
  • ๋ฐ”์ดํŠธ ๋ฐฐ์—ด๋กœ ๋ณ€ํ™˜(getBytes())
  • ๋ฌธ์ž์—ด ์ฐพ๊ธฐ(indexOf())
  • ๋ฌธ์ž์—ด ๊ธธ์ด(length())
  • ๋ฌธ์ž์—ด ๋Œ€์น˜(replace())
  • ๋ฌธ์ž์—ด ์ž˜๋ผ๋‚ด๊ธฐ(substring())
  • ์•ŒํŒŒ๋ฒณ ๋Œ€์†Œ๋ฌธ์ž ๋ณ€๊ฒฝ(toLowerCase(),toUpperCase())
  • ๋ฌธ์ž์—ด ์•ž๋’ค ๊ณต๋ฐฑ ์ž˜๋ผ๋‚ด๊ธฐ(trim())
  • ๋ฌธ์ž์—ด ๋ณ€ํ™˜(valueOf())
  • StringBuffer, StringBuilder ํด๋ž˜์Šค
  • StringBuilder
  • StringBuffer
  • ์ฐธ์กฐ ๋ฌธ์„œ

Was this helpful?

  1. Java
  2. Basic

API - String, StringBuffer, StringBuilder

  • java.lang

ํด๋ž˜์Šค

์šฉ๋„

String

๋ฌธ์ž์—ด์„ ์ €์žฅํ•˜๊ณ  ์—ฌ๋Ÿฌ ๊ฐ€์ง€ ์ •๋ณด๋ฅผ ์–ป์„ ๋•Œ ์‚ฌ์šฉ

StringBuffer, StringBuilder

๋ฌธ์ž์—ด์„ ์ €์žฅํ•˜๊ณ  ๋‚ด๋ถ€ ๋ฌธ์ž์—ด์„ ์กฐ์ž‘ํ•  ๋•Œ ์‚ฌ์šฉ

String ํด๋ž˜์Šค

์ž๋ฐ”์˜ ๋ฌธ์ž์—ด์€ String ํด๋ž˜์Šค์˜ ์ธ์Šคํ„ด์Šค๋กœ ๊ด€๋ฆฐ๋œ๋‹ค. String ํด๋ž˜์Šค์˜ ๋‹ค์–‘ํ•œ ์ƒ์„ฑ์ž๋ฅผ ์ด์šฉํ•ด์„œ ์ง์ ‘ String๊ฐ์ฒด๋ฅผ ์ƒ์„ฑํ•  ์ˆ˜ ์žˆ๋‹ค.

๋ฆฌํ„ด ํƒ€์ž…

๋ฉ”์†Œ๋“œ๋ช…(๋งค๊ฐœ ๋ณ€์ˆ˜)

์„ค๋ช…

char

charAt(int index)

ํŠน์ • ์œ„์น˜์˜ ๋ฌธ์ž ๋ฆฌํ„ด

boolean

equals(Object anObject)

๋‘ ๋ฌธ์ž์—ด์„ ๋น„๊ต

byte[]

getBytes()

byte[]๋กœ ๋ฆฌํ„ด

byte[]

getBytes(charset charset)

๋ฌธ์ž์—ด ๋‚ด์—์„œ ์ฃผ์–ด์ง„ ๋ฌธ์ž์—ด์˜ ์œ„์น˜๋ฅผ ๋ฆฌํ„ด

int

length()

์ด ๋ฌธ์ž์ˆ˜๋ฅผ ๋ฆฌํ„ด

String

replace(CharSequence target, CharSequence replacement)

target๋ถ€๋ถ„์„ replacement๋กœ ๋Œ€์ฒดํ•œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด ๋ฆฌํ„ด

String

substring(int beginIndex)

beginIndex ์œ„์น˜์—์„œ ๋๊นŒ์ง€ ์ž˜๋ผ๋‚ธ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด ๋ฆฌํ„ด

String

substring(int beginIndex, int endIndex)

beginIndex ์œ„์น˜์—์„œ endIndex๊นŒ์ง€ ์ž˜๋ผ๋‚ธ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด ๋ฆฌํ„ด

String

toLowerCase()

์•ŒํŒŒ๋ฒณ ์†Œ๋ฌธ์ž๋กœ ๋ณ€ํ™˜ํ•œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด ๋ฆฌํ„ด

String

toUpperCase()

์•ŒํŒŒ๋ฒณ ๋Œ€๋ฌธ์ž๋กœ ๋ณ€ํ™˜ํ•œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด ๋ฆฌํ„ด

String

trim()

์•ž๋’ค ๊ณต๋ฐฑ์„ ์ œ๊ฑฐํ•œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด ๋ฆฌํ„ด

String

valueOf(int i) valueOf(double d)

๊ธฐ๋ณธ ํƒ€์ž… ๊ฐ’์„ ๋ฌธ์ž์—ด๋กœ ๋ฆฌํ„ด

์‚ฌ์šฉ ๋นˆ๋„๊ฐ€ ๋†’์€ ์ƒ์„ฑ์ž

๋„คํŠธ์›Œํฌ๋ฅผ ํ†ตํ•ด ๋ฐ›์€ ๋ฐ์ดํ„ฐ๋Š” ๋ณดํ†ต byte[] ๋ฐฐ์—ด์ด๋ฏ€๋กœ ์ด๊ฒƒ์„ ๋ฌธ์ž์—ด๋กœ ๋ณ€ํ™˜ํ•˜๊ธฐ ์œ„ํ•ด ์‚ฌ์šฉํ•œ๋‹ค.

//๋ฐฐ์—ด ์ „์ฒด๋ฅผ String ๊ฐ์ฒด๋กœ ์ƒ์„ฑ
String str = new String(byte[] bytes);
//์ง€์ •ํ•œ ๋ฌธ์ž์…‹์œผ๋กœ ๋””์ฝ”๋”ฉ
String str = new String(byte[] bytes, String charsetName);

//๋ฐฐ์—ด์˜ offset ์ธ๋ฑ์Šค ์œ„์น˜๋ถ€ํ„ฐ length๋งŒํผ String ๊ฐ์ฒด ์ƒ์„ฑ
String str = new String(byte[] bytes,int offset, int length);
// ์ง€์ •ํ•œ ๋ฌธ์ž์…‹์œผ๋กœ ๋””์ฝ”๋”ฉ
String str = new String(byte[] bytes, ,int offset, int length,String charsetName);
public static void main(String[] args){
    byte[] bytes = {72, 101, 108, 111, 32, 74, 97, 118, 97};

    String str1 = new String(bytes);
    System.out.println(str1); //=> Hello Java
    String str2 = new String(bytes,6,4);
    System.out.println(str2); //=>Java
}

ํ‚ค๋ณด๋“œ๋กœ๋ถ€ํ„ฐ ์ž…๋ ฅ๋ฐ›๋Š” ๋ฌธ์ž์—ด์—๋Š” ์—”ํ„ฐํ‚ค๋ฅผ ๋ˆŒ๋ €๋‹ค๋ฉด \r, \n์˜ ์ฝ”๋“œ๊ฐ’์ด ๋ฐ”์ดํŠธ ๋ฐฐ์—ด์— ์ €์žฅ๋œ๋‹ค. ์˜์–ด๋Š” 1byte, ๋‹ค๋ฅธ ๋‚˜๋ผ ์–ธ์–ด๋Š” 2byte๋กœ ํ‘œํ˜„๋˜๊ธฐ ๋•Œ๋ฌธ์— ์ž…๋ ฅ๋œ ๋ฌธ์ž ์ˆ˜์™€ ๋ฐ”์ดํŠธ ์ˆ˜๊ฐ€ ๋‹ค๋ฅผ ์ˆ˜ ์žˆ๋‹ค.

public static void main(String[] args){
    byte[] bytes = new byte[100];

    System.out.println("์ž…๋ ฅ : ");
    int readByteNo = System.in.read(bytes);
    String str2 = new String(bytes,0,readByteNo-2);
    System.out.println(str2);
}

๋ฌธ์ž์ถ”์ถœ(charAt())

๋งค๊ฐœ๊ฐ’์œผ๋กœ ์ฃผ์–ด์ง„ ์ธ๋ฑ์Šค์˜ ๋ฌธ์ž๋ฅผ ๋ฆฌํ„ดํ•œ๋‹ค.

String sub = "์ž๋ฐ” ํ”„๋กœ๊ทธ๋ž˜๋ฐ";
char charVal = sub.charAt(3);
//=>ํ”„

๋ฌธ์ž์—ด ๋น„๊ต(equals())

String val1 = new String("Java");
String val2 = "java";
va1.equals(val2);
//=>true

๋ฐ”์ดํŠธ ๋ฐฐ์—ด๋กœ ๋ณ€ํ™˜(getBytes())

๋„คํŠธ์›Œํฌ๋กœ ๋ฌธ์ž์—ด์„ ์ „์†กํ•˜๊ฑฐ๋‚˜, ๋ฌธ์ž์—ด์„ ์•”ํ˜ธํ™”ํ•  ๋•Œ ๋ฌธ์ž์—ด์„ ๋ฐ”์ดํŠธ ๋ฐฐ์—ด๋กœ ๋ณ€ํ™˜ํ•œ๋‹ค.

byte[] bytes = "๋ฌธ์ž์—ด".getBytes();

์‹œ์Šคํ…œ์˜ ๊ธฐ๋ณธ ๋ฌธ์ž์…‹์œผ๋กœ ์ธ์ฝ”๋”ฉ๋œ ๋ฐ”์ดํŠธ ๋ฐฐ์—ด์„ ๋ฆฌํ„ดํ•œ๋‹ค. ๋งŒ์•ฝ ํŠน์ • ๋ฌธ์ž์…‹์œผ๋กœ ์ธ์ฝ”๋”ฉ๋œ ๋ฐ”์ดํŠธ ๋ฐฐ์—ด์„ ์–ป์œผ๋ ค๋ฉด ๋‹ค์Œ ๋ฉ”์†Œ๋“œ๋ฅผ ์‚ฌ์šฉํ•˜๋ฉด๋œ๋‹ค.

byte[] bytes = "๋ฌธ์ž์—ด".getBytes(Charset charset);
byte[] bytes = "๋ฌธ์ž์—ด".getBytes("UTF-8");

์—ฌ๊ธฐ์„œ EUC-KR์€ ํ•œ๊ธ€ 2byte, UTF-8์€ 3byte๋กœ ๋ณ€ํ™˜ํ•œ๋‹ค.

์‹œ์Šคํ…œ ๊ธฐ๋ณธ ๋ฌธ์ž์…‹๊ณผ ๋‹ค๋ฅธ ๋ฌธ์ž์…‹์œผ๋กœ ์ธ์ฝ”๋”ฉ๋œ ๋ฐ”์ดํŠธ ๋ฐฐ์—ด์ผ ๊ฒฝ์šฐ ๋‹ค์Œ String ์ƒ์„ฑ์ž๋ฅผ ์ด์šฉํ•ด ๋””์ฝ”๋”ฉ ํ•  ์ˆ˜ ์žˆ๋‹ค.

String str = new String(byte[] bytes,String charsetName);

getBytes(Charset charset) ๋ฉ”์†Œ๋“œ๋Š” ์ž˜๋ชป๋œ ๋ฌธ์ž์…‹์„ ๋งค๊ฐœ๊ฐ’์œผ๋กœ ์ค„ ๊ฒฝ์šฐ UnsupportedEncodingException์˜ˆ์™ธ๊ฐ€ ๋ฐœ์ƒํ•˜๋ฏ€๋กœ ์˜ˆ์™ธ์ฒ˜๋ฆฌ๊ฐ€ ํ•„์š”ํ•˜๋‹ค.

try{
    byte[] bytes = "๋ฌธ์ž์—ด".getBytes("UTF-8");
}catch(UnsupportedEncodingException e){
    e.printStackTrace();
}

๋ฌธ์ž์—ด ์ฐพ๊ธฐ(indexOf())

๋งค๊ฐœ๊ฐ’์œผ๋กœ ์ฃผ์–ด์ง„ ๋ฌธ์ž์—ด์ด ์‹œ์ž‘๋˜๋Š” ์ธ๋ฑ์Šค๋ฅผ ๋ฆฌํ„ดํ•œ๋‹ค. ๋งŒ์•ฝ ์ฃผ์–ด์ง„ ๋ฌธ์ž์—ด์ด ํฌํ•จ๋˜์–ด ์žˆ์ง€์•Š์œผ๋ฉด -1์„ ๋ฆฌํ„ดํ•œ๋‹ค.

String sub = "java programming";
int index = sub.indexOf("programming");
//=>5
if(๋ฌธ์ž์—ด.indexOf("์ฐพ๋Š” ๋ฌธ์ž์—ด")!=-1){
    //ํฌํ•จ๋œ ๊ฒฝ์šฐ
}else{
    //ํฌํ•จ๋˜์–ด์žˆ์ง€์•Š์€ ๊ฒฝ์šฐ
}

๋ฌธ์ž์—ด ๊ธธ์ด(length())

๋ฌธ์ž์—ด์˜ ๊ธธ์ด๋ฅผ ๋ฆฌํ„ดํ•œ๋‹ค.

String sub = "java programming";
int length = sub.length();
//=>16

๋ฌธ์ž์—ด ๋Œ€์น˜(replace())

์ฒซ ๋ฒˆ์งธ ๋งค๊ฐœ๊ฐ’์ธ ๋ฌธ์ž์—ด์„ ์ฐพ์•„ ๋‘๋ฒˆ์งธ ๋งค๊ฐœ๊ฐ’์ธ ๋ฌธ์ž์—ด๋กœ ๋Œ€์น˜ํ•œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด์„ ์ƒ์„ฑํ•˜๊ณ  ๋ฆฌํ„ดํ•œ๋‹ค.

String old = "ruby programming";
String new = old.replace("ruby","java");
//=>java programming

๋ฌธ์ž์—ด ์ž˜๋ผ๋‚ด๊ธฐ(substring())

์ฃผ์–ด์ง„ ์ธ๋ฑ์Šค์—์„œ ๋ฌธ์ž์—ด์„ ์ถ”์ถœํ•œ๋‹ค.

String old = "java programming";
String first = old.substring(0,4);
//=>java
String seconde = old.substring(5);

์ธ๋ฑ์Šค ํฌํ•จ ๋ฒ”์œ„๋Š” startIndex<= new < endIndex์ด๋‹ค.

์•ŒํŒŒ๋ฒณ ๋Œ€์†Œ๋ฌธ์ž ๋ณ€๊ฒฝ(toLowerCase(),toUpperCase())

toLowerCase()๋Š” ๋ชจ๋‘ ์†Œ๋ฌธ์ž๋กœ ๋ณ€๊ฒฝ, toUpperCase()๋Š” ๋ชจ๋‘ ๋Œ€๋ฌธ์ž๋กœ ๋ณ€๊ฒฝํ•ด์ค€๋‹ค.

String str = "Java Programming";
str.toLowercase();
//=>"java programming"
str.toUppercase();
//=>"JAVA PROGRAMMING"

์ด๋•Œ ๋Œ€์†Œ๋ฌธ์ž ๊ด€๊ณ„์—†์ด ๊ฐ™์€์ง€ ๋น„๊ตํ•ด์ฃผ๋ ค๋ฉด equalsIgnoreCase() ๋ฉ”์†Œ๋“œ๋ฅผ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋‹ค.

str1.equalsIgnoreCase(str);

๋ฌธ์ž์—ด ์•ž๋’ค ๊ณต๋ฐฑ ์ž˜๋ผ๋‚ด๊ธฐ(trim())

๋ฌธ์ž์—ด์˜ ์•ž๋’ค ๊ณต๋ฐฑ์„ ์ œ๊ฑฐํ•œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด์„ ์ƒ์„ฑํ•˜๊ณ  ๋ฆฌํ„ดํ•œ๋‹ค.

String str = "       Java Programming        ";
str.trim();
//=>"Java Programming"

trim์„ ์‚ฌ์šฉํ•œ๋‹ค๊ณ  ํ•ด์„œ ์›๋ž˜ ๋ฌธ์ž์—ด์˜ ๊ณต๋ฐฑ์ด ์ œ๊ฑฐ๋˜๋Š” ๊ฒƒ์€ ์•„๋‹ˆ๋‹ค.

๋ฌธ์ž์—ด ๋ณ€ํ™˜(valueOf())

๊ธฐ๋ณธ ํƒ€์ž…์˜ ๊ฐ’์„ ๋ฌธ์ž์—ด๋กœ ๋ณ€ํ™˜ํ•˜๋Š” ๊ธฐ๋Šฅ์„ ๊ฐ€์ง€๊ณ  ์žˆ๋‹ค. ๋งค๊ฐœ๋ณ€์ˆ˜ ํƒ€์ž… ๋ณ„๋กœ ์˜ค๋ฒ„๋กœ๋”ฉ ๋˜์–ด์žˆ๋‹ค.

static String valueOf(boolean b)
static String valueOf(char c)
static String valueOf(int i)
static String valueOf(long l)
static String valueOf(double d)
static String valueOf(float f)

StringBuffer, StringBuilder ํด๋ž˜์Šค

๋ฌธ์ž์—ด์„ ์ €์žฅํ•˜๋Š” String์€ ๋‚ด๋ถ€์˜ ๋ฌธ์ž์—ด์„ ์ˆ˜์ •ํ•  ์ˆ˜ ์—†๋‹ค. ์˜ˆ๋ฅผ ๋“ค์–ด์„œ String์˜ replace() ๋ฉ”์†Œ๋“œ๋Š” ๋Œ€์น˜๋œ ์ƒˆ๋กœ์šด ๋ฌธ์ž์—ด์„ ๋ฆฌํ„ดํ•˜๋Š” ๊ฒƒ์ด์ง€ ๋‚ด๋ถ€ ๋ฌธ์ž์—ด์„ ๋Œ€์น˜ํ•˜๋Š” ๊ฒƒ์ด ์•„๋‹ˆ๋‹ค.

+ ์—ฐ์‚ฐ์—๋„ ๋งˆ์ฐฌ๊ฐ€์ง€ ์ด๋‹ค.

String str1 = "abc";
str1+="defg";

๋Š” "abc"๊ฐ์ฒด๋Š” ๊ทธ๋Œ€๋กœ ์žˆ๊ณ , "abcdefg"์˜ ์ƒˆ๋กœ์šด ๊ฐ์ฒด๊ฐ€ ์ƒ์„ฑ๋œ ํ›„ ์ƒˆ๋กœ ์ƒ์„ฑ๋œ ๊ฐ์ฒด๋ฅผ ์ฐธ์กฐํ•˜๊ฒŒ ๋œ๋‹ค.

๋ฌธ์ž์—ด์„ ๊ฒฐํ•ฉํ•˜๋Š” + ์—ฐ์‚ฐ์ž๋ฅผ ๋งŽ์ด ์‚ฌ์šฉํ•˜๋ฉด ํ• ์ˆ˜๋ก ๊ทธ๋งŒํผ String ๊ฐ์ฒด์˜ ์ˆ˜๊ฐ€ ๋Š˜์–ด๋‚˜๊ธฐ ๋•Œ๋ฌธ์— ํ”„๋กœ๊ทธ๋žจ ์„ฑ๋Šฅ์„ ๋А๋ฆฌ๊ฒŒ ํ•˜๋Š” ์š”์ธ์ด ๋œ๋‹ค.

๋ฌธ์ž์—ด์„ ๋ณ€๊ฒฝํ•˜๋Š” ์ž‘์—…์ด ๋งŽ์„ ๊ฒฝ์šฐ์—๋Š” String ํด๋ž˜์Šค๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ๋ณด๋‹ค StringBuffer, StringBuilde ํด๋ž˜์Šค๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด ์ข‹๋‹ค. ์ด ๋‘ ํด๋ž˜์Šค๋Š” ๋‚ด๋ถ€ Buffer(:๋ฐ์ดํ„ฐ๋ฅผ ์ž„์‹œ๋กœ ์ €์žฅํ•˜๋Š” ๋ฉ”๋ชจ๋ฆฌ)์— ๋ฌธ์ž์—ด์„ ์ €์žฅํ•ด๋‘๊ณ , ๊ทธ ์•ˆ์—์„œ ์ถ”๊ฐ€, ์ˆ˜์ •, ์‚ญ์ œ ์ž‘์—…์„ ํ•  ์ˆ˜ ์žˆ๋„๋ก ์„ค๊ณ„๋˜์–ด ์žˆ๋‹ค. ์ฆ‰, String์ฒ˜๋Ÿผ ์ƒˆ๋กœ์šด ๊ฐ์ฒด๋ฅผ ๋งŒ๋“ค์ง€ ์•Š๊ณ ๋„ ๋ฌธ์ž์—ด์„ ์กฐ์ž‘ํ•  ์ˆ˜ ์žˆ๋Š” ๊ฒƒ์ด๋‹ค.

๋‘ ํด๋ž˜์Šค์˜ ์‚ฌ์šฉ๋ฐฉ๋ฒ•์€ ๋™์ผํ•˜๋‚˜ ์ฐจ์ด์ ์€ StringBuffer๋Š” ๋ฉ€ํ‹ฐ ์Šค๋ ˆ๋“œ ํ™˜๊ฒฝ์—์„œ ์‚ฌ์šฉํ•  ์ˆ˜ ์žˆ๋„๋ก ๋™๊ธฐํ™”๊ฐ€ ์ ์šฉ๋˜์–ด ์žˆ์–ด ๋ฉ€ํ‹ฐ ์Šค๋ ˆ๋“œ์— ์•ˆ์ „(thread-safe)ํ•˜์ง€๋งŒ, StringBuilder ๋Š” ๋‹จ์ผ ์Šค๋ ˆ๋“œ ํ™˜๊ฒฝ์—์„œ๋งŒ ์‚ฌ์šฉํ•˜๋„๋ก ์„ค๊ณ„๋˜์–ด ์žˆ๋‹ค.

StringBuilder

// 16๊ฐœ ๋ฌธ์ž๋“ค์„ ์ €์žฅํ•  ์ˆ˜ ์žˆ๋Š” ์ดˆ๊ธฐ๋ฒ„ํผ
StringBuilder sb = new StringBuilder();
//์ฃผ์–ด์ง„ ๊ฐœ์ˆ˜๋งŒํผ ๋ฌธ์ž๋“ค์„ ์ €์žฅํ•  ์ˆ˜ ์žˆ๋Š” ์ดˆ๊ธฐ ๋ฒ„ํผ
StringBuilder sb = new StringBuilder(16);
// ์ฃผ์–ด์ง„ str๋งค๊ฐœ๊ฐ’์„ ๋ฒ„ํผ์˜ ์ดˆ๊ธฐ๊ฐ’์œผ๋กœ ์ €์žฅ
StringBuilder sb = new StringBuilder("Java");

๋ฒ„ํผ๊ฐ€ ๋ถ€์กฑํ•  ๊ฒฝ์šฐ ์ž๋™์œผ๋กœ ๋ฒ„ํผ ํฌ๊ธฐ๋ฅผ ๋Š˜๋ฆฌ๊ธฐ ๋•Œ๋ฌธ์— ์ดˆ๊ธฐ ๋ฒ„ํผ์˜ ํฌ๊ธฐ๋Š” ๊ทธ๋‹ค์ง€ ์ค‘์š”ํ•˜์ง€ ์•Š๋‹ค.

๋ฉ”์†Œ๋“œ

์„ค๋ช…

append(...)

๋ฌธ์ž์—ด ๋์— ์ฃผ์–ด์ง„ ๋งค๊ฐœ๊ฐ’์„ ์ถ”๊ฐ€

insert(...)

๋ฌธ์ž์—ด ์ค‘๊ฐ„์— ์ฃผ์–ด์ง„ ๋งค๊ฐœ๊ฐ’ ์ถ”๊ฐ€

delete(int start,int end)

๋ฌธ์ž์—ด์˜ ์ผ๋ถ€๋ถ„ ์‚ญ์ œ

deleteCharAt(int index)

๋ฌธ์ž์—ด์—์„œ ์ฃผ์–ด์ง„ index์˜ ๋ฌธ์ž๋ฅผ ์‚ญ์ œ

replace(int start, int end, String str)

๋ฌธ์ž์—ด์˜ ์ผ๋ถ€๋ถ„์„ ๋‹ค๋ฅธ ๋ฌธ์ž์—ด๋กœ ๋Œ€์น˜

StringBuilder reverse()

๋ฌธ์ž์—ด์˜ ์ˆœ์„œ๋ฅผ ๋’ค๋ฐ”๊ฟˆ

setCharAt(int index, char ch)

๋ฌธ์ž์—ด์—์„œ ์ฃผ์–ด์ง„ index์˜ ๋ฌธ์ž๋ฅผ ๋‹ค๋ฅธ ๋ฌธ์ž๋กœ ๋Œ€์น˜

append์™€ insert ๋ฉ”์†Œ๋“œ๋Š” ๋งค๊ฐœ๋ณ€์ˆ˜๊ฐ€ ๋‹ค์–‘ํ•œ ํƒ€์ž…์œผ๋กœ ์˜ค๋ฒ„๋กœ๋”ฉ ๋˜์–ด ์žˆ์œผ๋ฏ€๋กœ ๋Œ€๋ถ€๋ถ„ ๊ฐ’์„ ๋ฌธ์ž๋กœ ์ถ”๊ฐ€, ์‚ฝ์ž…ํ•  ์ˆ˜ ์žˆ๋‹ค.

StringBuilder sb = new StringBuilder();

sb.append("JAVA ");
sb.append("Programming");
// ๋ฒ„ํผ์— ์žˆ๋Š” ๊ฒƒ์„ Stringํƒ€์ž…์œผ๋กœ ๋ฆฌํ„ด
sb.toString();

sb.insert(4,"2");
//=>JAVA2 Programming

sb.setCharAt(4,'6');
//=>JAVA6 Programming

sb.replace(6,17,"Book");
//=>JAVA6 Book

sb.delete(4,5);
//=>JAVA Book

StringBuffer

StringBuffer stringBuffer = new StringBuffer();
StringBuilder stringBuilder = new StringBuilder();

new Thread(() -> {
    for(int i=0; i<10000; i++) {
        stringBuffer.append(i);
        stringBuilder.append(i);
    }
}).start();

new Thread(() -> {
    for(int i=0; i<10000; i++) {
        stringBuffer.append(i);
        stringBuilder.append(i);
    }
}).start();

new Thread(() -> {
    try {
        Thread.sleep(5000);

        System.out.println("StringBuffer.length: "+ stringBuffer.length());
        System.out.println("StringBuilder.length: "+ stringBuilder.length());
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
}).start();
    StringBuffer.length: 77780
    StringBuilder.length: 76412

StringBuilder์™€ StringBuffer์˜ ๊ฒฐ๊ณผ ๊ฐ’์ด ๋‹ค๋ฅธ ๊ฒƒ์„ ๋ณผ ์ˆ˜ ์žˆ๋‹ค. ์ด๋Š” thread๋“ค์ด ๋™์‹œ์— StringBuilder ํด๋ž˜์Šค์— ์ ‘๊ทผํ•  ์ˆ˜ ์žˆ์–ด ๋” ์ž‘์€ ์ˆ˜๊ฐ€ ๋‚˜์˜จ ๊ฒƒ์ด๋‹ค. String Buffer๋Š” multi-thread ํ™˜๊ฒฝ์—์„œ ๋‹ค๋ฅธ ๊ฐ’์„ ๋ณ€๊ฒฝํ•˜์ง€ ๋ชปํ•˜๋„๋ก ๋™๊ธฐํ™”(Synchronization)๋˜์–ด์žˆ๋‹ค.

๊ทธ๋Ÿฌ๋ฏ€๋กœ Web์ด๋‚˜ Socket๊ณผ ๊ฐ™์ด ๋น„๋™๊ธฐ๋กœ ๋™์ž‘ํ•˜๋Š” ๊ฒฝ์šฐ๊ฐ€ ๋งŽ์„๋•Œ๋Š” StringBuffer๋ฅผ ์‚ฌ์šฉํ•˜๋Š” ๊ฒƒ์ด ์•ˆ์ „ํ•˜๋‹ค.

์ฐธ์กฐ ๋ฌธ์„œ

PreviousAPI - Object, System, Class, Math, WrapperNextThread

Last updated 5 years ago

Was this helpful?

https://novemberde.github.io/2017/04/15/String_0.html