DefaultMutableTreeNode-Text is too long?

Question

I have some DefaultMutableTreeNode\'s. While the programm\'s running, I can change the text and revalidate it. But if the text is too long, so for example the text \"tested\

Answer 1

• you have to read tutorial about JTree, and examples how to use TreeCellRenderer

• if you'll real question then please update your question and add there the code in SSCCE form

Answer 2

the underlying reason is that the layout of the tree nodes is cached and the cache not updated properly. Might f.i. happen if the node is changed under feet of the model, uncomment the nodeChanged to see the difference

    JTree tree = new JTree();
    DefaultMutableTreeNode root = (DefaultMutableTreeNode) tree.getModel().getRoot();
    int index = 0;
    DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
    String result = "\n";
    Enumeration<?> enumer = root.preorderEnumeration();
    while (enumer.hasMoreElements()) {
        DefaultMutableTreeNode node = (DefaultMutableTreeNode) enumer.nextElement();
        String nodeValue = String.valueOf(node.getUserObject());
        node.setUserObject(nodeValue + ": " + index++);
       //model.nodeChanged(node);
    }

The exact reason in your context might vary, no way to tell without an sscce