Binary tree in java

If you want to practice data structure and algorithm programs, you can go through 100+ java coding interview questions.

This is 1st part of java binary tree tutorial.

• Binary tree in java
• Binary tree preorder traversal
• Binary tree postorder traversal
• Binary tree inorder traversal
• Binary tree level order traversal
• Binary tree spiral order traversal
• Binary tree reverse level order traversal
• Binary tree boundary traversal
• Print leaf nodes of binary tree
• Count leaf nodes in binary tree
• get maximum element in binary tree
• Print all paths from root to leaf in binary tree
• Print vertical sum of binary tree in java
• Get level of node in binary tree in java
• Lowest common ancestor(LCA) in binary tree in java

A binary tree is a tree data structure in which each node has at most two children, which are referred to as the left child and the right child

Example of binary tree:

I have posted various programs on binary tree so that you can practice them for interviews and it will also help in understanding recursion.

Binary tree traversals:

PreOrder traversal – In PreOrder traversal,each node is processed before either of its sub-trees.In simpler words,Visit each node before its children.

InOrder traversal : In InOrder traversal,each node is processed between subtrees.In simpler words,Visit left subtree, node and then right subtree.

PostOrder traversal: In PostOrder traversal,each node is processed after subtrees traversal.In simpler words,Visit left subtree,  right subtree and then node.
Level order traversal : In Level order traversal, tree is traversed by each level. It is same as breadth first search.

Spiral/Zigzag order traversal : In spiral order traversal, tree is traversed in spiral shape.
Binary tree reverse level order traversal: It is similar to level order but in reverse
Binary tree boundary traversal : This traversal traverse boundary of binary tree

Other Binary tree programs:

• Program to print leaf nodes of a binary tree in java.
• Program to count leaf nodes in a binary tree in java.
• Program to print all paths from root to leaf in a binary tree in java.
• get maximum element in binary tree
• Print vertical sum of binary tree in java
• Get level of node in binary tree in java
• Lowest common ancestor(LCA) in binary tree in java