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    <p>Focusing on your status area and using nested layouts produces the result shown below. Note in particular,</p> <ul> <li>Use <code>invokeLater()</code> to construct the GUI on the EDT.</li> <li>Use <code>javax.swing.Timer</code> to update the GUI on the EDT.</li> <li>Use <code>pack()</code> to make the window fit the preferred size and layouts of its subcomponents.</li> <li>Use the update policy of <code>DefaultCaret</code> to control scrolling.</li> <li>Avoid needless lazy instantiation in public accessors.</li> <li>Avoid <a href="https://stackoverflow.com/q/7229226/230513"><code>setXxxSize()</code></a>; override <code>getXxxSize()</code> judiciously.</li> <li>Critically examine the decision to extend <code>JFrame</code>.</li> </ul> <p><img src="https://i.stack.imgur.com/CGO5Z.png" alt="image"></p> <pre><code>import java.awt.Color; import java.awt.EventQueue; import java.awt.Font; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.BorderFactory; import javax.swing.Box; import javax.swing.BoxLayout; import javax.swing.JComboBox; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JSeparator; import javax.swing.JTabbedPane; import javax.swing.JTextArea; import javax.swing.JTextField; import javax.swing.Timer; import javax.swing.border.TitledBorder; import javax.swing.text.DefaultCaret; public class Tab extends JFrame { private JTextArea messageTextArea; private JPanel optionPanel, messagePanel; private JTabbedPane plotTabPane; public static void main(String[] args) { EventQueue.invokeLater(new Runnable() { @Override public void run() { final Tab tab = new Tab(); tab.setVisible(true); Timer t = new Timer(200, new ActionListener() { int count = 0; @Override public void actionPerformed(ActionEvent e) { tab.printRawMessage("testMessage" + count++); } }); t.start(); } }); } public Tab() { initComponents(); } private void initComponents() { this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel mainPanel = new JPanel(new GridLayout(1, 0)); Box leftPanel = new Box(BoxLayout.Y_AXIS); leftPanel.add(getLeftTopPanel()); leftPanel.add(getMessagePanel()); mainPanel.add(leftPanel); mainPanel.add(getRightPanel()); this.add(mainPanel); this.pack(); this.setLocationRelativeTo(null); } protected JPanel getLeftTopPanel() { optionPanel = new JPanel(); optionPanel.setBorder(BorderFactory.createTitledBorder(null, "Configuration", TitledBorder.LEFT, TitledBorder.TOP, new Font("null", Font.BOLD, 12), Color.BLUE)); JLabel label = new JLabel("Choose"); label.setHorizontalAlignment(JLabel.RIGHT); optionPanel.add(label); optionPanel.add(new JSeparator(JSeparator.VERTICAL)); optionPanel.add(new JComboBox( new String[]{"option1", "option2", "option3"})); optionPanel.add(new JLabel("Type")); optionPanel.add(new JTextField("3")); return optionPanel; } protected JTabbedPane getRightPanel() { plotTabPane = new JTabbedPane(); plotTabPane.add("Tab1", new JPanel()); plotTabPane.add("Tab2", new JPanel()); return plotTabPane; } protected JPanel getMessagePanel() { messagePanel = new JPanel(new GridLayout()); messagePanel.setBorder(BorderFactory.createTitledBorder(null, "Status Console", TitledBorder.LEFT, TitledBorder.TOP, new Font("null", Font.BOLD, 12), Color.BLUE)); final JScrollPane sp = new JScrollPane(getMessageTextArea()); sp.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS); messagePanel.add(sp); return messagePanel; } protected JTextArea getMessageTextArea() { messageTextArea = new JTextArea("", 10, 19); messageTextArea.setEditable(false); messageTextArea.setFont(new Font(null, Font.PLAIN, 20)); messageTextArea.setBorder(BorderFactory.createEmptyBorder(4, 4, 4, 4)); DefaultCaret caret = (DefaultCaret) messageTextArea.getCaret(); caret.setUpdatePolicy(DefaultCaret.ALWAYS_UPDATE); return messageTextArea; } public void printRawMessage(String rawMessage) { messageTextArea.append(rawMessage + "\n"); } } </code></pre>
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    1. COWow, thanks a lot for all the input. I never really "learned" how to properly code large-scale gui's, so this is of great help to me. :)
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    2. CORegarding "critically examine the decision to extend JFrame": In my application, I have several of these Tabs (extending JPanel, I just changed that for this SSCCE) that are in a single JFrame (well, an extension). I have a lot of methods in this extended JFrame like `addPlotData()`, `setSelectionList()` and stuff like that, that controls what the gui is showing. Would it be better to have some kind of `GuiManager` class that holds this JFrame and does all the operations? Or what is the preferred way to do this?
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    3. COOh and what do you mean with "Avoid needless lazy instantiation in public accessors."?
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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.

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