How do I run a java file using button click?

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Java

i have an pdfgenerator.java file with a main class.

and i have a form with a button.
now i want to run that java file when i click the button.

it says can't find symbol.

do i want to pass a varible from form to that java file or any other way.

private void pdfGenerateActionPerformed(java.awt.event.ActionEvent evt) {                                            
 
        PdfGenerator pdfgen = new PdfGenerator();
        pdfgen.run();
 
    }

What I have tried:

i have try to run that java file using these code..
but it gives me an error

PdfGenerator pdfgen = new PdfGenerator();
pdfgen.run();