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Editorial Team
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Asked: 2026-06-05T13:56:09+00:00

I have created a custom JTree. That tree could be filtered to show only

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I have created a custom JTree. That tree could be filtered to show only those nodes that contains given criteria (string). Now, is there any way to bold only that part of DefaulMutableTreeNode that contains searched string?

If a tree node has label = “StackOverflow” and user is searching for nodes that contains “Stack”, “StackOverflow” node would be rendered with “Stack” part bolded.

How to achieve that?

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1 Answer

  1. Editorial Team

    You need to set your own TreeCellRenderer.

    Example:

    The code below produces this screenshot:

    screenshot

    final JTextField field = new JTextField();
final JTree tree = new JTree(new String[] {"Hello World", "StackOverflow"});
tree.setCellRenderer(new DefaultTreeCellRenderer() {
    @Override
    public Component getTreeCellRendererComponent(JTree tree,
            Object value, boolean sel, boolean expanded, boolean leaf,
            int row, boolean hasFocus) {

        String search = field.getText();
        String text = value.toString();

        StringBuffer html = new StringBuffer("<html>");
        Matcher m = Pattern.compile(Pattern.quote(search)).matcher(text);
        while (m.find())
            m.appendReplacement(html, "<b>" + m.group() + "</b>");
        m.appendTail(html).append("</html>");

        return super.getTreeCellRendererComponent(
                tree, html.toString(), sel, expanded, leaf, row, hasFocus);
    }
});
field.addKeyListener(new KeyAdapter() {
    @Override public void keyReleased(KeyEvent e) { update(); }
    private void update() { 
        DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
        model.nodeStructureChanged((TreeNode) model.getRoot());
    }
});
JFrame frame = new JFrame("Test");
frame.add(field, BorderLayout.NORTH);
frame.add(tree, BorderLayout.CENTER);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 300);
frame.setVisible(true);
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