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Editorial Team
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Asked: 2026-05-24T22:35:13+00:00

Why the JTree does not show up? Here is my code: initComponents(); JTree treeView;

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Why the JTree does not show up? Here is my code:

    initComponents();
    JTree treeView;
    DefaultMutableTreeNode top = new DefaultMutableTreeNode("myBooks");
    DefaultMutableTreeNode category = new DefaultMutableTreeNode("Drama");
    DefaultMutableTreeNode book1 = new DefaultMutableTreeNode("Macbeth");
    DefaultMutableTreeNode book2 = new DefaultMutableTreeNode("Hamlet");
    category.add(book1);
    category.add(book2);
    top.add(category);
    treeView = new JTree(top);
    JScrollPane pane = new JScrollPane(treeView);
    mainPanel.add(pane);
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1 Answer

  1. Editorial Team

    To extend on Snicolas’ answer (1+ to him) you appear to be adding the JScrollPane to your mainPanel without regard for the layout manager used. I’m guessing that your GUI is using the GroupLayout, and if so, I suggest you use a layout manager that is more user friendly. Also, are you adding the pane JScrollPane after pack and setVisible(true) are called on the top-level window? If so you’ll need to revalidate and repaint the container that is receiving the new component.

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