Java Learning Note--java Introduction

Java Open Source Language

C language closed source language

IOS closed source system with object-c language development

Application classification (classification from type)

c/S (Client Server): non-networked software also belongs to C/s

b/S (Browser Server): webqq, website

Java Architecture:

Javase:java Base library for application development;

javame: Mobile (micro) device application development;

Java EE: website development use system;

To configure environment variables:

Open Computer Properties - Advanced - environment variable - system variable -path add the absolute path to the bin file under the JDK, new named classpath system variable path to JDK \lib The absolute path of the package + ". *; "

" There are many instructions in the Jdk\bin (java javac), jdk\lib a lot . The jar file is the underlying library,and theJava application executes the underlying library that requires directives and dependencies.

Application development

Development language:C, C+ + (CPP),C #(for Windows),Pascal(earlier),Java;

Java belongs to the interpretation language: the application is interpreted to the JVM (Java Virtual machine)

noun explanation

JDK(javase Development Kit) Basic development tools

JRE (Java Runtime Environment)Java Runtime Environment (includes JVM)

Java Learning Note--java Introduction