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.

Learn how a Java JAR file (Java Archive) allows you to package compiled code and other resources in a single file that is easily deployed and executed resources.

A Java compiler takes a text file and compiles it into a platform-independent Java file, meaning the compiled code can run on any OS. Learn how it works.