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    • Sieve of Eratosthenes
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    • Lcm, Gcd
  • TechTalk Review
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  • Books
    • CS Note for Interview
      • Ch1. Design Pattern & Programming paradigm
        • 1.1.1 Singleton Pattern
        • 1.1.2 Factory Pattern
        • 1.1.4 Observer Pattern
        • 1.1.5 Proxty Pattern & Proxy Server
        • 1.1.8 Model-View-Controller Pattern
        • 1.2.1 Declarative and Functional Programming
        • 1.2.2 Object Oriented Programming
      • Ch2. Network
        • 2.2.1 TCP/IP Four-Layer Model
        • 2.2.1-1 TCP 3, 4 way handshake
        • 2.3 Network Devices L4, L7
        • 2.4.1 ARP, RARP
        • 2.4.2 Hop By Hop Communication
        • 2.4.3 IP Addressing Scheme
      • Ch3. Operating System
        • 3.1.1 Roles and Structure of Operating Systems
        • 3.2.1 Memory Hierarchy
        • 3.2.2 Memory Management
        • 3.3.1 Processes and Compilation Process
        • 3.3.3 Memory Structure of a Process
        • 3.3.4 Process Control Block (PCB)
        • 3.3.5 Multiprocessing
        • 3.3.6 Threads and Multithreading
        • 3.3.7 Shared Resources and Critical Sections
        • 3.3.8 Deadlock
        • 3.4 CPU Scheduling Algorithm
      • Ch4. Database
        • 4.1 Database Basic
        • 4.2 Normalization
        • 4.3 Transaction and Integrity
        • 4.4 Types of Databases
        • 4.5 Indexes
        • 4.6 Types of Joins
        • 4.7 Principles of Joins
      • Ch5. Data Structure
    • Learning the Basics of Large-Scale System Design through Virtual Interview Cases
      • 1. Scalability based on user counts(1/2)
      • 1. Scalability based on user counts(2/2)
      • 2.Back-of-the-envelope estimation
      • 3. Strategies for System Design Interviews
      • 4. Rate Limiter
      • 5. Consistent Hashing
      • 6. Key-Value System Design
      • 7. Designing a Unique ID Generator for Distributed Systems
      • 8. Designing a URL Shortener
      • 9. Designing a Web Crawler
      • 10. Notification System Design
      • 11. Designing a News Feed System
      • 12. Chat System Design
      • 13. AutoComplete
      • 14. Design YouTube
      • 15. Design Google Drive
      • Loadbalancer Algorithms
      • Cache tier
      • CDN, Content Delivery Network
      • Stateless Web tier
    • Computer System A programmer's perspective
    • Effective Java
      • Item 1. Consider Static Factory Methods Instead of Constructors
      • Item 2. Consider a Builder When Faced with Many Constructor Parameters
      • Item 3. Ensure Singleton with Private Constructor or Enum Type
      • Item 4. Enforce Noninstantiability with a Private Constructor
      • Item 5. Prefer Dependency Injection to Hardwiring Resources
      • Item 6. Avoid Creating Unnecessary Objects
      • Item 7. Eliminate Obsolete Object References
      • Item 8. Avoid Finalizers and Cleaners
      • Item 9.Prefer try-with-resources to try-finally
      • Item10. Adhering to General Rules When Overriding equals
        • Handling Transitivity Issues
        • Ensuring Consistency
      • Item11. Override hashCode When You Override equals
      • Item12. Always Override toString
        • Always Override toString
      • Item13. Override Clone Judiciously
      • Item14. Consider Implementing Comparable
      • Item15. Minimize the Accessibility of Classes and Members
      • Item16. Accessor Methods Over Public Fields
      • Item17. Minimize Mutability
      • Item18. Composition over inherentance
      • Item19. Design and Document for Inheritance, or Else Prohibit It
      • Item20. Prefer Interfaces to Abstract Classes
      • Item21. Design Interfaces with Implementations in Mind
      • Item22. Use Interfaces Only to define Types
      • Item23. Prefer Class Hierarchies to Tagged Classes
      • Item24. Favor Static Member Classes Over Non-Static
      • Item28. Use Lists Instead of Arrays
      • Item29. Prefer Generic Types
      • Item30. Favor Generic Methods
    • Head First Design Patterns
      • Ch1. Strategy Pattern
      • Ch2. Observer Pattern
        • Ver1. Ch2. Observer Pattern
      • Ch3. Decorator Pattern
        • Ch3. Decorator Pattern
      • Ch4. Factory Pattern
      • Ch5. Singleton Pattern
      • Ch6. Command Pattern
      • Ch7. Adapter and Facade Pattern
      • Ch8. Template Method Pattern
    • Digging Deep into JVM
      • Chapter 2. Java Memory Area & Memory Overflow
      • Chapter 3. Garbage Collector & Memory Allocation Strategy (1/2)
      • Chapter 3. Garbage Collector & Memory Allocation Strategy (2/2)
      • Chapter 5. Optimization Practice
      • Chapter 6. Class file structure
      • Chapter 8. Bytecode Executor Engine (1/2)
  • Interview Practices
    • Restful API Practices
      • Url Shortener API
      • Event Ticket Reservation API
      • Course Management API
      • Search posts by tags API
      • Online Code platform API
      • Simple Task Management API
      • Event Participation API
      • Review System API
      • Car management API
      • Online Library
    • Tech Review
      • if(kakao)
        • Kakao Account Cache Migration / if(kakao)2022
        • Improving the Anomaly Detection System for KakaoTalk Messaging Metrics / if(kakao) 2022
        • Standardizing API Case Handling Without Redeployment / if(kakaoAI)2024
        • JVM warm up / if(kakao)2022
    • Naver Computer Science
      • Process & Thread
      • TCP & UDP
      • Spring & Servlet
      • Filter & Interceptor & AOP
      • Equals() & ==
      • Dependency Injection
      • Object Oriented Programming
  • F-Lab
    • Week1
      • Client & Server
      • HTTP
      • TCP/UDP
      • REST API
      • Questions
        • Object Oriented Programming
        • HTTP
        • Process & Thread
        • Data Structure
    • Week2
      • OSI 7 layer
      • Web vs WAS
    • Week3
      • RDB vs NoSQL
      • RDB Index
      • Cache
      • Redis
      • Messaging Queue
    • Week4
      • Project - Ecommerce
    • Week5
      • ERD - 1
    • Week6
      • Ecommerce - 2
      • Role
      • pw hashing && Salt
      • CreatedAt, ModifiedAt
      • JWT
      • Copy of ERD - 1
    • Week7
      • Vault (HashiCorp Vault)
    • Week 8
      • Api Endpoints
    • Week10
      • Product Create Workflow
  • TOY Project
    • CodeMentor
      • Implementation of Kafka
      • Project Improvement (Architectural Enhancements)
      • Communication between servers in msa
  • JAVA
    • MESI protocol in CAS
    • CAS (Compare and Set)
    • BlockingQueue
    • Producer & Consumer
    • Synchronized && ReentrantLock
    • Memory Visibility
    • Checked vs Unchecked Exception
    • Thread
    • Batch delete instead of Cascade
    • Java Questions
      • Week 1(1/2) - Basic Java
      • Week 1(2/2) - OOP
      • Week 2(1/2) - String, Exception, Generic
      • Week2(2/2) Lambda, Stream, Annotation, Reflection
      • Week3(1/2) Collections
      • Week3(2/2) Threads
      • Week4 Java Concurrency Programming
      • Week5 JVM & GC
    • Java 101
      • JVM Structure
      • Java Compiles and Execution Method
      • Override, Overload
      • Interface vs Abstract Class
      • Primitive vs Object Type
      • Identity and equality
      • String, StringBuilder, StringBuffer
      • Checked Exceptions and Unchecked Exceptions
      • Java 8 methods
      • Try-with-reources
      • Strong Coupling and Loose Coupling
      • Serialization and Deserialization
      • Concurrency Programming in Java
      • Mutable vs Immutable
      • JDK vs JRE
  • SPRING
    • DIP. Dependency Inversion Principal
    • Ioc container, di practice
    • @Transactional
    • Proxy Pattern
    • Strategy Pattern
    • Template Method Pattern
    • using profile name as variable
    • Spring Questions
      • Spring Framework
      • Spring MVC & Web Request
      • AOP (Aspect-Oriented Programming)
      • Spring Boot
      • ORM & Data Access
      • Security
      • ETC
  • DATABASE
    • Enhancing Query Performance & Stability - User list
    • Ensuring Data Consistency, Atomicity and UX Optimization (feat.Firebase)
    • Redis: Remote Dictionary Server
    • Database Questions
      • Week1 DBMS, RDBMS basics
      • Week2 SQL
      • Week3 Index
      • Week4 Anomaly, Functional Dependency, Normalization
      • Week5 DB Transaction, Recovery
    • Normalization
      • 1st Normal Form
      • 2nd Normal Form
      • 3rd Normal Form
  • NETWORK
    • HTTP & TCP head of line blocking
    • HTTP 0.9-3.0
    • Blocking, NonBlocking and Sync, Async
    • Network Questions
      • Week1 Computer Network Basic
      • Week2(1/3) Application Layer Protocol - HTTP
      • Week2(2/3) Application Layer Protocol - HTTPS
      • Week2(3/3) Application Layer Protocol - DNS
      • Week3 Application Layer
      • Week4 Transport Layer - UDP, TCP
      • Week5 Network Layer - IP Protocol
    • Network 101
      • https://www.google.com
      • TCP vs UDP
      • Http vs Https
      • TLS Handshake 1.2
      • HTTP Method
      • CORS & SOP
      • Web Server Software
  • OS
    • Operating System Questions
      • Week1 OS & How Computer Systems Work
      • Week2(1/2) Process
      • Week2(2/2) Thread
      • Week3 CPU Scheduling
      • Week4 Process Synchronize
      • Week5 Virtual Memory
    • Operating System 101
      • Operating system
        • The role of the operating system
        • The composition of the operating system.
      • Process
        • In Linux, are all processes except the initial process child processes?
        • Zombie process, orphan process
        • (Linux) Daemon process
        • Process address space
        • Where are uninitialized variables stored?
        • Determination of the size of the Stack and Heap
        • Access speed of Stack vs Heap
        • Reason for memory space partitioning
        • Process of compiling a process
        • sudo kill -9 $CURRENT_PID
      • Thread
        • Composition of a thread's address space
      • Process vs Thread
        • Creation of processes and threads in Linux
      • Multiprocessing
        • Web Browser
        • Implementation of multiprocessing
        • Application areas of multiprocessing
      • Multithreading
        • Application areas of multithreading
      • Interrupt
        • HW / SW Interrupt
        • Method of handling interrupts
        • Occurrence of two or more interrupts simultaneously
      • Polling
      • Dual Mode
        • Reason for distinguishing between user mode and kernel mode
      • System call
        • Differentiation between system calls
        • Types of system calls
        • Execution process of a system call
      • Process Control Block (PCB)
        • PCB의 구조
        • 쓰레드는 PCB를 갖고 있을까?
        • 프로세스 메모리 구조
      • Context switching
        • Timing of context switching
        • Registers saved during context switching
        • Context switching in processes
        • Context switching in threads
        • Difference between context switching in processes and threads
        • Information of the current process during context switching
      • Interprocess Communication (IPC)
        • Cases where IPC is used
        • Process address space in IPC Shared Memory technique
        • Types of IPC
  • COMPUTER SCIENCE
    • Computer Architecture 101
      • 3 components of a computer
      • RAM vs ROM
      • CPU vs GPU
      • SIMD
      • Two's complement
      • Harvard Architecture vs. von Neumann Architecture
      • The structure of a CPU.
      • Instruction cycle (CPU operation method)
      • Instruction pipelining
      • Bus
      • Memory area
      • Memory hierarchy structure
        • Reason for using memory hierarchy structure
      • Cache memory
      • L1, L2, L3 Cache
      • Locality of reference (cache)
      • Fixed-point vs Floating-point
        • epresentation of infinity and NaN (Not a Number) in floating-point
      • RISC vs CISC
      • Hamming code
      • Compiler
      • Linking
      • Compiler vs Interpreter
      • Mutex vs Semaphore
      • 32bit CPU and 64bit CPU
      • Local vs Static Variable
      • Page
  • Programming Paradigm
    • Declarative vs Imperative
  • JPA, QueryDsl
    • why fetchResults() is deprecated
  • PYTHON
    • Icecream
  • FASTAPI
    • Template Page
  • LINUX
    • Template Page
  • DATA STRUCTURE
    • Counting Sort
    • Array vs Linked List
  • GIT, Github
    • git clone, invalid path error
  • INFRA
    • Template Page
  • AWS
    • Server Log Archive Pipeline
    • Image Processing using Lambda
  • DOCKER
    • Docker and VM
    • Python Executable Environment
    • Docker commands
  • docker-compose
    • Kafka, Multi Broker
  • KUBERNATES
    • !Encountered Errors
      • my-sql restarts
      • kafka producer: disconnected
    • Kubernetes Components
    • Helm
      • Helm commands
    • Pod network
    • Service network
      • deployment.yaml
      • services.yaml
    • Service type
      • Cluster IP
      • NodePort
    • service-name-headless?
    • kube-proxy
  • GraphQL
    • Template Page
  • WEB
    • Template Page
  • Reviews
    • Graphic Intern Review
    • Kakao Brain Pathfinder Review
    • JSCODE 자바 1기 Review
  • 😁Dev Jokes
    • Image
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      • Google is generous
      • Genie dislikes cloud
      • buggy bugs
      • last day of unpaid internship
      • what if clients know how to inspect
      • its just game
      • how i wrote my achievement on resume
      • self explanatory
      • chr(sum(range(ord(min(str(not))))))
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On this page
  • 1. JDK, JRE
  • 1.1. JDK (Java Development Kit)
  • 1.2. JRE (Java Runtime Environment)
  • 1.3. JDK 구성요소
  • 1.4. JRE 구성요소
  • 2. JDK와 JRE의 차이점
  • 3. 자바 프로그램 실행 과정
  1. JAVA
  2. Java 101

JDK vs JRE

1. JDK, JRE

1.1. JDK (Java Development Kit)

애플리케이션을 개발하기 위한 소프트웨어 개발 도구입니다.

자바로 코드를 작성하고 컴파일하는 데 필요한 툴과 라이브러리들이 포함된 패키지입니다.

1.2. JRE (Java Runtime Environment)

자바 프로그램이 실행될 수 있는 환경(Environment)를 제공하며 실행에 초점을 둡니다. JVM 등, 자바 프로그램을 실행하는데 필요한 라이브러리와 클래스 파일들을 포함하고 있습니다.

실행할떄는 JRE만 설치되어도되며, 개발도구는 포함되지 않습니다.

1.3. JDK 구성요소

  • JRE (Java Runtime Environment) 자바 프로그램을 실행하기 위한 환경 제공

  • 컴파일러 컴파일러를 통해 자바 소스 파일을 바이트 코드로 변환합니다. 사람이 읽을 수 있는 .java 파일을 바이트 코드(.class)로 변환합니다.

  • 인터프리터 컴파일된 바이트 코드를 실제로 실행하는 것.

  • Javadoc 소스 파일에 작성된 주석을 기반으로 API 문서를 자동으로 생성해줍니다.

  • JAR (Java Archive Tool) 여러 개의 클래스 파일을 압축하여 하나의 파일로 묶는 툴

  • JDB (Java Debugger)

  • Keytool 자바 애플리케이션에서 사용할 인증서를 관리하는 도구

1.4. JRE 구성요소

  • JVM (Java Virtual Machine) 자바 프로그램이 실행되는 가상 머신. JVM은 독립적인 환경을 제공하며, 이를 통해 자바 프로그램은 한번 작성하면 다양한 플랫폼에서 실행될 수 있습니다.

  • 클래스 라이브러리 원활하게 실행하기 위한 표준 라이브러리 포함. (java.lang, java.util, javaj.io 등)

  • 클래스 로더 자바 클래스 파일을 메모리에 로드

  • 메모리 관리 GC를 통해 메모리를 자동으로 관리

2. JDK와 JRE의 차이점

JDK와 JRE의 가장 큰 차이점은 목적입니다. JDK는 개발을 위한 도구 모음이며, JRE는 실행을 위한 환경입니다. JDK에는 JRE가 포함되어 있으므로, JDK를 설치하면 JRE도 자동으로 설치됩니다.

구분
JDK
JRE

용도

자바 애플리케이션 개발

자바 애플리케이션 실행

포함 요소

JRE, 컴파일러, 디버거 등

JVM, 클래스 라이브러리 등

대상

개발자

최종 사용자

3. 자바 프로그램 실행 과정

  1. 소스 코드 작성

  2. 컴파일: JDK의 javac를 사용

    1. 컴파일러가 바이트 코드 생성

    2. 컴파일 타임 에러 검사

  3. 실행: JRE의 JVM을 통해 실행

    1. 클래스 로더를 통해 파일을 메모리에 로드

    2. 인터프리터를 통해 한줄씩 기계어로 변환 및 실행

    3. GC를 통해 더 이상 사용되지 않는 객체들을 메모리에서 제거

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Last updated 9 months ago