JTree, iterieren über alle Knoten

javax.swing.JTree

DefaultMutableTreeNode rootNode = ...
for (Enumeration e = rootNode.depthFirstEnumeration(); e.hasMoreElements();) {
   DefaultMutableTreeNode treeNode = (DefaultMutableTreeNode) e.nextElement();
   System.out.println(treeNode);
}

Stichworte:

TreeNode, iterieren, JTree