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Java  Interview Questions and Answers  
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Ans. public class BinarySearchTree { //Represent the node of binary tree public static class Node { int data; Node left; Node right; public Node(int data) { //Assign data to the new node, set left and right children to null this.data = data; this.left = null; this.right = null; } } //Represent the root of binary tree public Node root; public BinarySearchTree() { root = null; } //factorial() will calculate the factorial of given number public int factorial(int num) { int fact = 1; if (num == 0) return 1; else { while (num > 1) { fact = fact * num; num; } return fact; } } //numOfBST() will calculate the total number of possible BST by calculating Catalan Number for given key public int numOfBST(int key) { int catalanNumber = factorial(2 * key) / (factorial(key 1) * factorial(key)); return catalanNumber; } public static void main(String[] args) { BinarySearchTree bt = new BinarySearchTree(); //Display total number of possible binary search tree with key 5 System.out.println("Total number of possible Binary Search Trees with given key: " bt.numOfBST(5)); } }  
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