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Have you import the correct packages?

Try adding super() as the first line in your constructor and just see if that works

F6 runs the project, shift+F6 runs the individual class/java file. But that's not your issue it's asking for a super method in the constructor I think judging on that error message, although I didn't...

Sorry, learnt my lesson

--- Update ---


Sorry, learnt my lesson

Oh right, yeah I'm currently in my 2nd year studying it, got my main exam in it Friday. Lecturers get code wrong all the time and my 1st year professor was awful at teaching Java, luckily I taught...

Is this a complete class? You seem to have not declared lString or firstChar anywhere. I run it on my IDE and it just throws an error due to this.
Edit: You have declare firstChar but as firstchar....

Have you made sure netbeans knows this is the main class it needs to run? Its in the project properties, under the "run" tab you can select which class you want netbeans to run. Or just try shift+F6...