Swing JTree class problems... (feature request)...

Question

Hello,
I'd like to be able to change Nodes positions (at least two children inside the same parent node without having to remove/add them [which looses expanded/selected states]).
With regards,
Pavel Krupets

Answer 1

hi.,
use this. This will add new node with out collapsing the tree.
        treeModel = new DefaultTreeModel(rootNode);
        treeModel.addTreeModelListener (new MyTreeModelListener);
        jTree1.setModel(treeModel);
    jTree1.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
jScrollPane1.setViewPortView(jTree1);
private void addNode(String node)   // To add node.
        DefaultMutableTreeNode = parent;
        DefaultMutableTreeNode newNode = new DefaultMutableTreeNode(node); // newNode is the one which your need to insert in the JTree.
         parent = jTree1.getLastSelectedPathComponent(); // LAST SELECTED NODE.
         treeModel.insertNodeInto(newNode,parent,parent.getChildCount());
private void removeNode()   // To Remove selected node from tree.
   TreePath lastPath = jTree1.getSelectionPath();
    DefaultMutableTreeNode selectedNode = jTree1.getLastSelectedPathComponent();
    treeModel.removeNodeFromParent(selectedNode);
}