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    <p>You don't need to extend JFrame and in fact many of us who do a lot of Swing programming make it a point <em>not</em> to extend this class. Myself, I try to extend classes where I plan on altering the innate behavior of the class -- i.e., override one of the non-static methods of the class. Since I rarely have to do this for a JFrame, I'll rarely want to extend it.</p> <p>Another reason to avoid extending it: what if you later want to display the GUI you've just created in a JDialog or a JOptionPane or in another container as part of a complex GUI? If your class extends JFrame this will be hard to do. Myself, I try to gear my GUI classes towards creating JPanels so that this is much easier to do.</p> <p>A silly example based on your code:</p> <pre><code>import javax.swing.*; // this guy extends *nothing* public class TunaExample { private static final int COLS = 10; private JPanel mainPanel = new JPanel(); // this is what I'll add to contentPane private JTextField field1 = new JTextField(COLS); private JTextField field2 = new JTextField(COLS); private JPasswordField passwordField = new JPasswordField(COLS); private JComponent[] allComponents = { new JLabel("Field 1:"), field1, new JLabel("Field 2:"), field2, new JLabel("Password:"), passwordField }; public TunaExample() { field2.setEditable(false); field2.setFocusable(false); field1.setText("Field 1"); field2.setText("Uneditable"); for (JComponent comp : allComponents) { mainPanel.add(comp); } } public JComponent getMainComponent() { return mainPanel; } private static void createAndShowGui() { TunaExample tunaExample = new TunaExample(); // creating my JFrame only when I need it and where I need it JFrame frame = new JFrame("Tuna Example"); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.getContentPane().add(tunaExample.getMainComponent()); frame.pack(); frame.setLocationByPlatform(true); frame.setVisible(true); } public static void main(String[] args) { SwingUtilities.invokeLater(new Runnable() { public void run() { createAndShowGui(); } }); } } </code></pre>
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A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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