05 - Introduction to Java - Exercise 7

Hello World application

1. Open your IntelliJ IDEA and click on ‘New Project’.

2. Give your project a reasonable name - i.e. HelloWorld.

3. You don’t have to change anything else on this page, just note where the project will be saved - in your home folder in IdeaProjects.

4. You can click Finish.

5. After a short while the project will appear on the left hand side.

6. Right-click on the src folder and select New->Java Class. Name it Main .

8. Your project will be created and opened in your IntelliJ. You should see a file called Main.java. It contains a class definition with a main method. That's where we will place our code.

   

9. Type in System.out.println("Hello world!"); inside the main method.

   

10. Run your application - right-click into the Main.java file and select Run.

    

11. After a short while, you should see a similar output at the bottom part of your IntelliJ window.

    

12. Congratulations, you created your first Java application

Note: Indentation shortcut for IntelliJ Ctrl+Alt+I (letter ‘eye’) or Ctrl+Option+I for Mac.

Note: Quick comment shortcut Ctrl+/ or Command+/.