Sum of Two Numbers
Sum Multiples of Three and Five
Factorial
Linear Search
Reverse String
Find Maximum
Average Value (Java 8 Lambdas and Streams)
Convert to Upper Case (Java 8 Lambdas and Streams)
Nth Odd Element
Number Of Tree Nodes
Count Nodes in List
Count Number of Leaf Nodes
Binary Tree Depth
Find Second Largest Number in Array

Count the number of leaf nodes in a binary tree