Java-java Overview

1. Software Development

Software

A collection of computer data and instructions organized in a specific order

Development

The process of making software

Software development

Build software with development tools and computer language

2. Computer language

A special language for communicating information between people and computers

3. Human-Computer Interaction

The advent of software enables better interaction between people and computers

Interactive mode

1. Graphical interface

2. Command-line mode

4. Common DOS commands

D: Enter drive letter Toggle

Dir (directory): Lists the files and folders in the current directory

MD (Make directory): Create directory

RD (remove directory): Delete directory

CD (change directory) changes the specified directory (enter the specified directory)

CD: Back to top level directory

Cd\: Go back to the root directory

Del (delete): Delete files, delete a bunch of suffix names like files *.txt

Exit: Exit DOS command line

CLS: (Clear screen) clear

5.Overview of the Java language

Java language Platform version

J2SE (Java 2 Platform standard Edition) edition

is a solution for developing common desktop and business applications

J2ME (Java 2 Platform micro Edition) Mini version

is a solution for developing electronic consumer products and embedded devices

EE (Java 2 Platform Enterprise Edition) Corporate Edition

is a suite of solutions for developing applications in enterprise environments

Java language Features

Simplicity of interpretation

Object-oriented high performance

Distributed processing multithreading

Dynamic dynamics of Robustness

Structural neutrality security

Open source

Cross-platform

JRE and JDK

JRE (Java Runtime Environment Java Run environment)

JDK (Java Development Kit Java Development Kit)

6. introduction of development tools

Notepad (Microsoft OS comes with)

notepad++

Eclipse

MyEclipse

7,HelloWorld

Class helloworld{public static void Main (String [] args) {System.out.println ("Hello World"); }}

8. operation and working principle

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9 . Configuration of environment variables

Create a new variable name: Java_home

Add variable values for Java_home: JDK installation directory

Modify the JDK directory in the PATH environment variable

%java_home%\bin;

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Java-java Overview