Java learning notes -- java introduction and java learning notes Introduction

Java learning notes -- java introduction and java learning notes Introduction

Java open-source language

C Language

IOS closed-source system is developed using object-C Language

 

Application category (from type category)

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

Browser Server (B/S): WebQQ, website

 

Java architecture:

Javase: basic library for java application development;

Javame: Mobile (micro) device application development;

Javaee: website development and usage system;

 

Configure environment variables:

Open "Computer properties"> "advanced"> "environment variable"> "system variable"> "path" to add the absolute path of the binfile under jdk, and create the classpath system variable path as the absolute path of jdk \ lib package + ". *;"

[JDK \ bin contains many commands (java javac). Many Jdk \ lib. jar files are the base library, and the base library for instructions and dependencies for java application execution]

 

Application Development

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

Java is an interpreted language: the application is interpreted to jvm (Java virtual machine)

 

Glossary

JDK (Javase development Kit) basic development tools

JRE (java runtime environment) Java runtime environment (including jvm)