How to build a java runtime environment

Build java running environment

The overall process is divided into two steps

1. Download JDK (java dovelop kit, referred to as java development tool)

First we directly download the java development tool kit JDK

2. Select the version you want to use and click download. The following is the information about each version

Java Platfrom Standard Edition (referred to as Standard Edition java SE)

This version is usually used for entry-level use and is suitable for small application development and desktop applications

It allows the development and deployment of Java applications for use in desktop, server, embedded and real-time environments,

Java Platfrom Enterprise Edition (referred to as Enterprise Edition Java EE)

The powerful version used by programmers at work, the enterprise version helps develop and deploy server-side Java applications that are portable, robust, scalable, and secure.

Java Platfrom Micro Edition (referred to as Micro Edition JAVA ME)

Used for mobile application development, providing a robust and flexible environment for applications running on mobile devices and embedded devices (such as mobile phones, PDAs, TV set-top boxes and printers)

To put it simply

Java SE is software that runs on computers.

Java EE is used to build websites-(our common JSP technology)

Java ME is made for mobile phones.

3. After clicking Download, the following picture will appear. You must first check to agree to the agreement before downloading, and then select your own operating system to download, Mac or Windows, Linux

4. Install JDK. During the installation process, you can customize the installation directory and other information. For example, we choose the installation directory as C:\Program Files (x86)\Java\jdk1.8.0_91

## 5. Right-click on My Computer-----Properties--Advanced System Settings--Environment Variables--System Variables--Create 3 new properties in "System Variables", if they already exist, click " Edit", click "New" if it does not exist.

The variable setting parameters are as follows:

l Variable name: JAVA_HOME

l Variable value: C:\Program Files (x86)\Java\jdk1.8.0_91

l // Configure according to your actual file installation path

l Variable name: CLASSPATH

l Variable value: .;%JAVA_HOME%\lib\dt.jar;%JAVA_HOME%\lib\tools.jar;

l //Remember there is a "."

in front of it l Variable name: Path

l Variable value: %JAVA_HOME%\bin;%JAVA_HOME%\jre\bin;

6. Test whether the JDK is installed successfully

Windows key R to open Run ——Enter cmd——Open the command prompt---Type the command: javac

If the following figure appears, the environment variables are configured successfully.

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