// Build up a bunch of TreeNodes. We use DefaultMutableTreeNode because the
// DefaultTreeModel can use that to build a complete tree.
DefaultMutableTreeNode root = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode subroot = new DefaultMutableTreeNode("SubRoot");
DefaultMutableTreeNode leaf1 = new DefaultMutableTreeNode("Leaf 1");
DefaultMutableTreeNode leaf2 = new DefaultMutableTreeNode("Leaf 2");
// Build our tree model starting at the root node, and then make a JTree out
// of that.
treeModel = new DefaultTreeModel(root);
tree = new JTree(treeModel);
// Build the tree up from the nodes we created
treeModel.insertNodeInto(subroot, root, 0);
treeModel.insertNodeInto(leaf1, subroot, 0);
treeModel.insertNodeInto(leaf2, root, 1);
// And display it
getContentPane().add(tree, BorderLayout.CENTER);
