How to configure the JDK environment variable in Java?

You can set up the Java JDK environment variable by following these steps:

1. To download and install Java JDK: First, you need to download and install Java JDK. You can download the appropriate version from the Oracle official website and follow the installation guide for installation.
2. Locate the installation path of Java: After installation is complete, find the installation path of Java JDK, which is usually located in the C:\Program Files\Java directory.
3. Set up system environment variables: In the Windows operating system, right-click on “Computer” or “This PC,” select “Properties,” then click “Advanced system settings,” and in the pop-up window, click on “Environment Variables.”
4. In the environment variables window, locate the “Path” variable under “System Variables,” click on the “Edit” button, and add the installation path of Java JDK to the “Variable Value,” for example: C:\Program Files\Java\jdk1.8.0_261\bin (note that the path should be modified according to the actual installation location).
5. Set the system variable JAVA_HOME by clicking on “New” in the Environment Variables window, entering the variable name “JAVA_HOME”, and setting the variable value to the installation path of Java JDK, such as C:\Program Files\Java\jdk1.8.0_261.
6. Set the CLASSPATH variable (optional): If you need to set the CLASSPATH variable, you can create a new variable in the system variables named “CLASSPATH” with a value of “.;%JAVA_HOME%\lib;%JAVA_HOME%\lib\tools.jar” (Note: Modify the paths according to your actual situation).
7. Save and close the environment variables window, then reopen the command prompt window and type “java -version” and “javac -version” to check if the Java environment variables have been configured successfully.

The steps above outline how to configure the Java JDK environment variables in Windows systems. The configuration process may vary for different operating systems.