Cover Data Structures and Algorithms with Object-Oriented Design Patterns in Java
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Postorder Traversal

The second depth-first traversal method we consider is postorder traversal  . In contrast with preorder traversal, which visits the root first, postorder traversal visits the root last. To do a postorder traversal of a general tree:

  1. Do a postorder traversal each of the subtrees of the root one-by-one in the order given; and then
  2. visit the root.
To do a postorder traversal of a binary tree
  1. Traverse the left subtree; and then
  2. traverse the right subtree; and then
  3. visit the root.
A postorder traversal of the tree shown in Figure gif visits the nodes in the following order:

displaymath62726

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Bruno Copyright © 1998 by Bruno R. Preiss, P.Eng. All rights reserved.