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.

Run your Hello World! program in Onecompiler Once you navigate to Onecompiler and select the JShell editor, you’ll find a program that runs the seminal Hello World! app is already coded for you. Click ...

You don’t need to compile your Java code. Java programs will run without a main method. Semicolons can be optional. Hundreds of extra classes are imported automatically. Exception handling is optional ...

I’ll help you set up a Java Development Kit (JDK) on your system so that you can develop and run Java programs, and I’ll get you started with the architecture of a typical Java application.