Question

I am developing a small desktop application in Net beans. I drag and drop a JTree on my JFrame and now i want to fill the node hierarchy of this this JTree dynamically. For this i wrote a method which return me DefaultMutableTreeNode object. Now i again create tree with this object but the tree still shows old (default) nodes:

DefaultMutableTreeNode root = createJTreeNodes();
jTree1 = new JTree(root);
jTree1.repaint();
jTree1.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);

Could any one guide that what i need to change, in order to populate tree dynamically?

Answer 1

Could any one guide that what i need to change, in order to populate tree dynamically?

A couple of different options:

DefaultTreeModel model = (DefaultTreeModel)tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode)model.getRoot();
root.add(new DefaultMutableTreeNode("another_child"));
model.reload(root);

or

DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
model.insertNodeInto(new DefaultMutableTreeNode("another_child"), root, root.getChildCount());