First Glimpse java--1 (download JADK, build environment variables)

Window System Installation Java

First we need to download the Java SDK jdk,:http://www.oracle.com/technetwork/java/javase/downloads/index.html, click the download button below:

In the download page you need to choose to accept the license and choose the corresponding version according to your own system, this article takes the Window 64-bit system as an example:

After downloading the JDK installation according to the prompts, as well as installing the JDK will also install the JRE, installed on it.

Install the JDK, you can customize the installation directory and other information, such as we choose to install directory C:\Program Files (x86) \java\jdk1.8.0_91.

Configuring Environment variables

1. After the installation is complete, right click on "My Computer", click "Properties", select "Advanced System Settings";

2. Select the "Advanced" tab and click on "Environment variables";

The screen will then appear as shown:

Set 3 properties in "System variable", Java_home,path,classpath (case does not matter), if already exist then click "Edit", not exist then click "New".

The variable setting parameters are as follows:

• Variable name:java_home
• Variable value:C:\Program Files (x86) \java\jdk1.8.0_91 //To be configured according to your actual path

• Variable name:CLASSPATH
• Variable value:.;         %java_home%\lib\dt.jar;%java_home%\lib\tools.jar; Remember, there's a "." in front.

• Variable name:Path
• Variable value:%java_home%\bin;%java_home%\jre\bin;

Java_home settings

Path settings

CLASSPATH settings

This is the Java environment configuration, after the configuration is complete, you can start Eclipse to write code, it will automatically complete the configuration of the Java environment.

Note: If you use more than 1.5 versions of the JDK, you can compile and run the Java program normally without setting the CLASSPATH environment variable.

Test whether the JDK was installed successfully

1, "Start", "Run", type "cmd";

2, type the command: java-version,java,javac Several commands, the following information appears, indicating that the environment variable configuration is successful;

First Glimpse java--1 (download JADK, build environment variables)