import javax.swing.*;
import java.awt.event.*;

public class Namer extends JFrame                       
{

      public static void main(String [] args)
      {
          new Namer();
      }

      private JButton buttonOK;
      private JTextField textName;                       
      public Namer()
      {
          this.setSize(325,100);
          this.setTitle("Who Are You?");
          this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

          ButtonListener bl = new ButtonListener();

          JPanel panel1 = new JPanel();

          panel1.add(new JLabel("Enter your name: "));       
          textName = new JTextField(15);                     
          panel1.add(textName);

          buttonOK = new JButton("OK");
          buttonOK.addActionListener(bl);
          panel1.add(buttonOK);

          this.add(panel1);

          this.setVisible(true);
      }

      private class ButtonListener implements ActionListener
      {
          public void actionPerformed(ActionEvent e)
          {
              if (e.getSource() == buttonOK)
              {
                  String name = textName.getText();            

                  if (name.length() == 0)                      
                  {
                      JOptionPane.showMessageDialog(Namer.this, "You didn't", "Moron", JOptionPane.INFORMATION_MESSAGE);
                  }
                  else
                  {
                      JOptionPane.showMessageDialog(Namer.this, "Good morning " + name, "Salutations", JOptionPane.INFORMATION_MESSAGE);
                  }
                  textName.requestFocus();                     
              }
          }
      }
}