Today I Learned

• 미루지 말기 내일의 나를 믿지 말기

• 중요한 내용은 한 번 더 다듬어서 블로그에 업로드하기

• Issue, Project 기능 적극 활용하기

---

algorithm

• Binary Search

• Brute Force Search

• DFS BFS

• Dijkstra

• Dynamic Programming

• Floyd-Warshall

• Greedy

• Sort

data-structure

• Array, List, LinkedList

• Graph vs Tree

• Hash, Map, HashMap

• Heap

• Stack Queue

database

• Database Lock

• Execution Plan

• Index

• Join Algorithm

• MySQL 사용자 권한부여

• Normalization

• Row Oriented vs Column Oriented

• Transaction

• Transaction Isolation Level

• VARCHAR의 길이제한

design-pattern

• Abstract Factory Pattern

• Adapter Pattern

• Bridge Pattern

• Builder Pattern

• Chain of Responsibility Pattern

• Class Diagram

• Command Pattern

• Composite Pattern

• Decorator Pattern

• Facade Pattern

• Factory Method Pattern

• Flyweight Pattern

• Iterator Pattern

• Mediator Pattern

• Memento Pattern

• Observer Pattern

• Prototype Pattern

• Proxy Pattern

• SOLID

• Singleton Pattern

• State Pattern

• Strategy Pattern

• Template Method Pattern

• UML

• 객체지향 패러다임

• 결합도와 응집도

docker

• Docker

• Docker Network

• Volume vs Bind Mount

etc

• Gradle

• Gradle daemon

• block-vs-non-block-sync-vs-async

git

• Git Merge vs Git Rebase

• Interactive Rebase

• 자주 사용하는 Git 명령어 모음

java

• Annotation

• Call method by reflection

• Exception Handling

• Generic

• Generic wildcard를 이용한 extends super 사용 시 주의할 점

• Graceful shutdown

• JVM

• Java21 Improvement Record, Switch

• Java21 Sequenced Collections

• Java21 Virtual Thread

• Java 코드의 실행 과정

• Lambda Expression

• Object Class

• Optional

• Primitive Type & Reference Type

• ReentrantLock

• Reflection

• Serialize And Deserialize

• Statement vs Prepared Statement

• Stream

• String, StringBuilder, StringBuffer

• Thread-safe Collection

• Tiles

• Type Casting

• Why is sort() a static method

• map vs flatMap

• tomcat architecture

• 추상클래스와 인터페이스의 차이

effective-java

• Item 1. static factory method

• Item 10. override equals

• Item 11. override hashCode

• Item 12. override toString

• Item 13. override clone

• Item 14. implement comparable

• Item 15. field access modifier

• Item 16. get method

• Item 17. minimize mutability

• Item 18. use composition instead extend

• Item 19. prepare docs if extend

• Item 2. builder pattern

• Item 20. abstract class vs interface

• Item 21. interface default method

• Item 22. use interface only type

• Item 23. use class hierarchy

• Item 24. member class

• Item 25. only one top level class

• Item 26. don't use raw type

• Item 27. remove unchecked warning

• Item 28. replace array with list

• Item 29. use generic type

• Item 3. singleton

• Item 30. use generic method

• Item 31. use wildcard type

• Item 32. varargs with generic

• Item 33. type safe heterogeneous container

• Item 34. enum type

• Item 35. don't use enum ordinal

• Item 36. EnumSet

• Item 37. EnumMap

• Item 38. use interface for extend enum

• Item 39. annotation

• Item 4. private constructor

• Item 40. @Override

• Item 41. marker interface

• Item 42. replace anonymous class with lambda

• Item 43. method reference

• Item 44. default functional interface

• Item 45. stream

• Item 46. collector

• Item 47. return collection

• Item 48. stream parallel

• Item 49. validate parameter

• Item 5. dependency injection

• Item 50. make defensive copies

• Item 51. design method signatures carefully

• Item 52. use overloading judiciously

• Item 53. varargs

• Item 54. return array or collections instead of null

• Item 54. use optional judiciously

• Item 55. return optional judiciously

• Item 56. write javadoc

• Item 57. minimize scope of local variable

• Item 58. for-each

• Item 59. use library

• Item 6. reuse instance

• Item 60. if you need accurate answer, avoid float and double

• Item 61. use primitive type instead of wrapper

• Item 62. avoid string

• Item 63. avoid concat string

• Item 64. refer interface

• Item 65. reflection

• Item 66. avoid using native method

• Item 67. optimize judiciously

• Item 68. naming convention

• Item 69. use exceptions only for exceptional conditions

• Item 7. eliminate unused reference

• Item 70. checked, unchecked exception

• Item 71. avoid using unnecessary checked exceptions

• Item 72. use default exception

• Item 73. translate low level exception

• Item 74. documentation exceptions thrown by method

• Item 75. include failure capture information in detail messages

• Item 76. strive for failure atomicity

• Item 77. don't ignore exceptions

• Item 78. synchronize access to shared mutable data

• Item 79. avoid excessive synchronization

• Item 8. avoid using finalizer, cleaner

• Item 80. prefer executors, tasks, and stream to threads

• Item 81. prefer concurrency utilities to wait and notify

• Item 82. document thread safety

• Item 83. use lazy initialization judiciously

• Item 84. don't depend on the thread scheduler

• Item 85. prefer alternatives to java serialization

• Item 86. implement serializable with great caution

• Item 87. consider using a custom serialized form

• Item 88. write readObject methods defensively

• Item 89. for instance control, prefer enum types to readResolve

• Item 9. try-with-resources

• Item 90. consider serialization proxies instead of serialized instances

jpa

• @DynamicInsert, @DynamicUpdate

• Entity Manager

• Find by EntityManager vs JPQL select query

• JPA

• JPA Cascade

• JPA Entity Equality

• JPA Entity LifeCycle

• JPA Entity Lifecycle Event

• JPA bulk update

• Lock

• Open Session In View

• save() vs saveAndFlush()

junit

• Argument Matcher, Argument Captor

• JUnit 4의 @Test 메서드는 public 이어야 했는데, JUnit 5 부터는 public이 아니어도 되는 이유

querydsl

• Projection

• QueryDSL Setup

• [우이콘2020] 수십억건에서 Querydsl 사용하기

kubernetes

• 쿠버네티스를 왜 쓰는가

linux

• Linux의 Permission

• kill

network

• CIDR

• Forward Proxy vs Reverse Proxy

• Forward vs Redirect

• HTTP의 진화와 버전별 특징

• OSI 7 Layer

• SSL, TLS

• Subnet

• 그림으로 배우는 http & network basic

operating-system

• Block vs Non-block, Sync vs Async

python

• Python의 재귀제한

server

• CI&CD

• Cache

• Cloud Service

• 정적 서버와 동적 서버

spring

• @Async

• @Configuration

• @RequestParam @RequestBody @ModelAttribute

• AOP

• Autowired

• Bean Scope

• Bean could not be injected because it is a JDK dynamic proxy

• Component Scan

• Component vs Bean

• Configuration 분리

• DI

• Embedded tomcat

• Filter, Interceptor, Spring AOP

• IoC Container

• Nested Class의 Bean 등록

• Profile

• Properties

• Servlet container vs Spring container

• Spring Bean Life Cycle

• Spring Event

• Spring vs SpringBoot

• Thymeleaf

jpa

• Dirty Checking

• JPA Fetch 전략

• JPA N+1 Problem

spring-boot

• Spring Web Layer

• spring-boot

spring-mvc

• Argument Resolver

• Filter

• Filter vs OncePerRequestFilter

• Interceptor

• RestController

• Validator

• exception-handling

• spring-mvc

spring-security

• Spring Security

testing

• Test Double

• White Box, Black Box

web

• API

• Browser Caching

• CORS

• HTTP Header

• HTTP와 HTTPS

• OAuth

• PRG Pattern

• Query Parameter & Path Variable

• REST

• Status Code

• WebSocket

• application octet stream

• cookie-session

• jwt

• multipart form data

images

• jwt-flow