How to run a Java program using Command Prompt First things first, you will have to write the code that you want to run and save that as a Java executable file.

If you've run into common JAVA_HOME errors such as JAVA_HOME not found or JAVA_HOME set to an invalid directory, we've got the fix for you with these tips.

Moreover, the Java that is deployed on servers is relatively safer as compared to using Java on desktop systems. Java may also be required to open a website or run a program.