Thread: I have a problem when creating a class

What is the error? Please copy and paste the full stack trace instead of posting a screenshot.

What code are you running? Please copy and paste an MCVE instead of posting a screenshot.

What specific error are you getting?

Are these classes in two separate files?

Is one of them in a package?

Have you imported the class you're trying to use?

I can't access imgur, which is why we ask you to copy/paste the text instead.

If the class you're using is in a different package than the class you're in, you either need to import it or use the fully qualified name (include the package info before the class).

Recommended reading: Using Package Members (The Java™ Tutorials > Learning the Java Language > Packages)

Originally Posted by jeffpascal

I just tired something... when i clicked File>new file> java class> next There is a Package tab. I didn't type anything in it, and it seems its working... In the tutorial i was following they were typing the name of the main file... I am confused

I just tired something... when i clicked File>new file> java class> next There is a Package tab. I didn't type anything

I highly recommend you ditch the IDE and use the command line and a basic text editor until you understand the basics.

Your original problem was that you were trying to use the Persoana class inside your Program class. Since Persoana is inside a package, you have to import it to be able to use it.

Since you modified your code so Persoana is no longer inside a package, you no longer had to import it, and your code magically worked again.

It's not always a good idea to use the default package (no package). It's up to you though.

Originally Posted by jeffpascal

And an off topic question, its something that troubled me about java since i started looking into it , and now that i started learning classes troubles me more...

When i create a new project it comes with this line pre-configured

why is that ( public class NameOfProject { ) there?, does it have to be there?
I understand that public static void main has to be there because the program looks for the main and starts executing instructions from there.

What happened when you tried to remove the part you're confused about?

You can't have a method outside of a class. So to have a main() method, you have to have a class. I highly recommend using a basic text editor and the command line until you understand basics like that.

Originally Posted by KevinWorkman

I highly recommend you ditch the IDE and use the command line and a basic text editor until you understand the basics.

Your original problem was that you were trying to use the Persoana class inside your Program class. Since Persoana is inside a package, you have to import it to be able to use it.

Since you modified your code so Persoana is no longer inside a package, you no longer had to import it, and your code magically worked again.

It's not always a good idea to use the default package (no package). It's up to you though.



What happened when you tried to remove the part you're confused about?

You can't have a method outside of a class. So to have a main() method, you have to have a class. I highly recommend using a basic text editor and the command line until you understand basics like that.

I understand. I use the IDE because the tutorial i am following uses it, and i understand better. If you know other tutorials that use text editor, i will use them. Thank you for the answers.
ps: i use this http://www.functionx.com/java/