private void btnMathsActionPerformed(java.awt.event.ActionEvent evt) {//GEN-FIRST:event_btnMathsActionPerformed
        // TODO add your handling code here:
         try
        {
            Runtime.getRuntime().exec("rundll32 url.dll, FileProtocolHandler "+"C:\\Users\\Brian Murphy\\Desktop\\"
                    + "StudentServices\\src\\studentservices\\maths.pdf");
        }catch (Exception e)
        {
            JOptionPane.showMessageDialog(null, "error");
        }
        
    }//GEN-LAST:event_btnMathsActionPerformed