Tree iterator is a convinient and easy-to-use tree-traversing Java utility suitable for any kind of tree. It employs pre-order tree traversal algorithm (node is processed before its children). Two things set the tree iterator apart from a traditional way of traversing a treelike structure:

• Tree iterator is generic. It can traverse any type of a treelike structure as long as the appropriate adapter class is provided. Adapters for DOM tree and Swing (javax.swing.tree.TreeNode) are provided with the iterator.
• Tree iterator is also capable of performing selective traversal. For example, it is possible to direct iterator to skip certain branches of a tree based on some criteria. Or, alternatively, calling code can dynamically change the depth of the traversal for different branches.

Documentation:

Programmer's Guide

Javadoc API