Trully need help folks......

Question

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class VideoStoreMainFrame extends JFrame
     private JButton managerButton, cashierButton, customerButton;
     private JLabel note;
     public VideoStoreMainFrame()
          super("Video Store Graphical User Interface");
          Container container = getContentPane();
          container.setLayout(new GridLayout(10,1,1,1));
          container.setBackground( Color.white );
          managerButton = new JButton("Manager");
          container.add(managerButton);
          managerButton.setBackground( Color.red);
          cashierButton = new JButton("Cashier");
          container.add(cashierButton);
          cashierButton.setBackground( Color.red);
          customerButton = new JButton("Customer");
          container.add(customerButton);
          customerButton.setBackground( Color.red);
          ButtonHandler handler = new ButtonHandler();
          managerButton.addActionListener(handler);
          cashierButton.addActionListener(handler);
          customerButton.addActionListener(handler);
          managerButton.setToolTipText("Manager");
          cashierButton.setToolTipText("Cashier");
          customerButton.setToolTipText("Customer");
          note = new JLabel("Press the buttons the best regards you.");
          container.add(note);
          setSize(300, 300);
          setVisible(true);
     public static void main(String args[]) throws NullPointerException
          VideoStoreMainFrame frame = new VideoStoreMainFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     private class ButtonHandler implements ActionListener
          public void actionPerformed(ActionEvent event)
               JOptionPane.showMessageDialog(null,"You Are A: " + event.getActionCommand());

Answer 1

Secondly, your main method doesn't need to throw any
exceptions.Throwing excepitons is only done when needed.
>
Also, you can't use a class name only to fire a
method.( JOptionPane.showMessageDialog(null,"You Are
A: " + event.getActionCommand());)Yes you can. In this case, showMessageDialog() is declared as static making it a class method. This means you do not need an instance to use the method.