1장 java란 무엇인가.key

[email protected] | performeister.tistory.com | twitter @novathinkerJava Performance Fundamental

Java란 무엇인가

[email protected] | performeister.tistory.com | twitter @novathinkerJava Performance Fundamental 2

Java Architecture1) Java Architecture

2) Java Programming Language

3) Java Class File Format

4) Java API

Java Virtual Machine1) What is JVM?

2) JVM Architecture



Java Architecture

1) Java Architecture



Java Architecture


자기야!자바가 뭐야..?



Java Architecture


자기야!자바가 뭐야..?

응, 그거는프로그램 짤 때 쓰는 언어야.



Java Architecture


Java는 상호 관련된 4가지 기술로 구성

The Java Programming Language

The Java Class File Format

The Java Application Programming Interface

The Java Virtual Machine



Java Architecture


A.java B.java C.java

Javacompiler

A.class B.class C.class

Java source file

Java class file

Object.class String.classJava API’s class files

Java class file

A.class B.class C.class

Java Virtual Machine

Com

pile

Tim

e Run Time



Java Architecture


Java Language

생산성의 극대화 최신 Software 기술의 적용



Java Architecture


Source Code의 재사용

Memory관리에서 해방

Array bound check를 통한 Program의 corruption방지

Object Reference check를 통한 Null Reference 방지

Java Language




Java Architecture


object-orientation

multi-threading

structured error-handling

garbage collection

dynamic linking

dynamic extension

Source Code의 재사용

Memory관리에서 해방

Array bound check를 통한 Program의 corruption방지

Object Reference check를 통한 Null Reference 방지

Java Language




Java Architecture




Java Architecture


Compact한 형태



Java Architecture


Compact한 형태

Bytecode로 변경



Java Architecture


Compact한 형태

Bytecode로 변경

Platform 독립적



Java Architecture


Compact한 형태

Bytecode로 변경

Platform 독립적

Network byte order의사용



Java Architecture

4) Java API (Application Programming Interface) Runtime Library의 집합 Platform Independent

Host Operating System

Java API Java API Java API

Native Method (dynamic libraries)

Java Class Java Class Java Class




• Java Virtual Machine

9




1) What is JVM?

JAVA

Virtual

Machine

SoftWare

하나의 Machine과 같이

Java를 위한




1) What is JVM?

Write once, run everywhere

H/W Platform & OS


Compiled Java Program



Abstract Specification

A Runtime Instance

Concrete Implement


1) What is JVM?

JAVA의 핵심

SINGLE RUNNING

JVM = CONCEPT

VENDOR별 구현




Java Application

(Real-Time) Operating System

NativeMethodLibraries

Class Libraries Class Loader System

Execution Engine

Run-timeData Area

GarbageCollector

2) JVM Architecture

JavaThreads

Nat

ive

Thre

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