## Find number of leaf nodes in a binary tree (Java/ BFS /example)

What is leaf node in binary tree?

A node in a binary tree which do not have any child nodes is called leaf node. The leaf node do not have any children i.e. left and right reference both null. We have to count the number of leaf nodes in the binary tree. In other ways we need to find out all the nodes in the binary tree which do not have any children (both right node and left node null).

So as per our problem statement, we have to iterate over the binary tree and find the number of leaf nodes in the binary tree.