JDK Environment Variable Setup Guide

The environmental variable configuration for JDK (Java Development Kit) can be divided into the following steps:

1. Download the JDK installation file: First, you need to download the appropriate JDK installation file for your operating system from the official Oracle website. Make sure to choose the installation file that matches your operating system version and bit size (32-bit or 64-bit).
2. To install JDK, double click on the JDK installation file and follow the installation wizard’s instructions. Choose a suitable installation path, typically it is recommended to install JDK in the default path.
3. Find the installation path of the JDK: After installation, locate the installation directory of the JDK in the chosen installation path. For example, in the Windows system, the default installation path is “C:\Program Files\Java\jdk version number”.
4. To set the JAVA_HOME environment variable: Open the control panel, click on “System and Security”, select “System”, click on “Advanced system settings”. In the dialog box that appears, click on the “Environment Variables” button. In the list of system variables, click on the “New” button. In the “Variable name” field, enter “JAVA_HOME”, in the “Variable value” field, enter the path of the JDK installation (found in step 3), then click “OK”.
5. Configure the Path environment variable: In the system variable list, locate the variable named “Path”, double click on it, and add “;%JAVA_HOME%\bin” to the end of the “Variable value” field. Note that different systems may use different path separators, for example, in Windows systems, use a semicolon (;) as the path separator. Once done, click the “OK” button.
6. Set up the CLASSPATH environment variable (optional): If you need to use Java libraries or third-party libraries, you can set the CLASSPATH environment variable. In the system variables list, click on the “New” button. Enter “CLASSPATH” in the “Variable name” field, and enter the paths of the libraries you need to include in the “Variable value” field, using a semicolon (;) to separate multiple paths. Once done, click on the “OK” button.
7. Verify Configuration: Open a command prompt or terminal window and run the following command to validate the JDK environment variable configuration:
8. Print the version of Java installed on your device by typing:
   java -version

   Check the version of the Java compiler installed by typing:
   javac -version

9. If you can see the version information of JDK, it means the configuration is successful.

The above steps outline how to configure the JDK environment variables. Please note that these steps may vary depending on the operating system and version, so adjust accordingly to your specific situation.