Now you should get the point that why this algorithm is called pre-order? well, because the order is determined by root, if you visit the root first, it's preOrder, if you visit the root second it's in inOrder, and if you visit the root third, or last, its post-order traversal.Īpart from these three basic traversal algorithms, there are also more sophisticated algorithms to traverse a binary tree, you can check a comprehensive course like Data Structures and Algorithms: Deep Dive Using Java to learn more about different types of trees e.g. In PreOrder, you visit the root or node first, followed by the left subtree and the right subtree, but in the post order algorithm, you visit the root node at the last. The order in which you visit these three nodes determines the type of algorithms. While traversing a tree, you need to visit three elements, root node, left subtree, and right subtree. The PreOrder, InOrder, and PostOrder traversals are all examples of depth-first traversal algorithms. all nodes of one level are visited before you start with another level top to bottom. On breadth-first traversal, you visit the tree on its breadth i.e. In depth-first, you go deeper into a tree before visiting the sibling node, for example, you go deep following the left node before you come back and traverse the right node. Tree traversal algorithms are mainly divided into two categories, the depth-first algorithms, and breadth-first algorithms. ![]() Unlike array and linked list which have just one way to traverse, I mean linearly, the binary tree has several ways to traverse all nodes because of its hierarchical nature like level order, preorder, postorder, and in order. The recursive solution is hardly 3 to 4 lines of code and exactly mimic the steps, but before that, let's revise some basics about a binary tree and preorder traversal. The easiest way to implement the preOrder traversal of a binary tree in Java is by using recursion.
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