Issue to code

Sorry, which packages should be imported to resolve it?

For instance, I see that

ResultSet cannot be resolved to a type

is the error on line below. How to resolve it?

       ResultSet rs = stmt.executeQuery(sql);

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How to disallow to edit the textarea below?

public class Main {
      public static void main( String[] args )
      {
            try
            {
                  final JFrame frame = new JFrame( "Information" );
                  final JPanel mainPanel = new JPanel();
                  mainPanel.setPreferredSize ( new Dimension( 800, 700 ) );
                  frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
                  frame.getContentPane().add ( mainPanel );
                  frame.setLocationRelativeTo( null );

                  // JTextArea supports a subset of HTML and with that you
                  // can change fonts within the text.
                  final JTextArea textArea = new JTextArea(
                              "This is an editable JTextArea. "
                                          + "A text area is a \"plain\" text component, "
                                          + "which means that although it can display text "
                                          + "in any font, all of the text is in the same font." );
                  textArea.setFont( new Font( "Serif", Font.BOLD, 12 ) );
                  textArea.setLineWrap( true );
                  textArea.setWrapStyleWord( true );

                  mainPanel.add( textArea );

                  frame.pack();
                  frame.setVisible( true );      // should be last

                  beep();
            }
            catch( final Exception e )
            {
                  final JPanel panel2 = new JPanel();

                  JOptionPane.showMessageDialog( panel2, e, "Error",
                              JOptionPane.ERROR_MESSAGE );
            }

      }

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