Run HelloWorld

  • Run a Java program in IntelliJ.

Next, we want to "run" the HelloWorld.java file in IntelliJ. You will notice a green "play" button next to the main method.

What if I don't see the green play button?

Let's ensure the project settings are correct.

  • Go to the "File" menu and open "Project Structure."
  • On the left pane, look under "Project Settings" and select "Project."
  • Make sure the "Project SDK" is set to 1.8.
  • Make sure the "Project Language Level" is set to 8.

Click on the play button to run the program; you must see "Hello World" printed on the output panel.

Aside: You may have noticed a green play button next to the HelloWrold class declaration. You can alternatively run the program using this button. The process is identical.