How Do I Access Class File In Java Button Click Event?

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Java

MySQL

Visa class is my class file and i want to run that file when i clicked ok button
but this gives me an error?

private void OK_BtnActionPerformed(java.awt.event.ActionEvent evt) {
       // TODO add your handling code here:
       Box1 = User_Name.getText();
       Box2 = User_Password.getText();

       LoginClass Log = new LoginClass();
       Log.setUname("bob");

       VisaClass();
   }

please help me to solve this issue?