If Java is not recognized as internal or external command, you need to make sure that the installation is not problematic and its path is recognized as system variables.

At the command prompt, type “java -version” (again, no quotes). Users also can visit Java.com and click the “Do I have Java?” link on the homepage.

Get inside the Java shell, with this hands-on demonstration of building advanced UI consoles and REPLs in Java.

How install Java 21 on Windows Follow these steps to quickly install Java 21 on your operating system: Navigate to jdk.java.net and download your platform’s zip file. Extract the Java 21 zip file to a ...

You can check which Java version is on your Mac to see if you have the most up-to-date Java running, or you can check on the Java website.