![//recursive insert function
Node search_Recursive(Node root, int key) {
// Base Cases: root is null or key is present at root
if (root==null || root.key==key)
return root;
// val is greater than root's key
if (root.key > key)
return search_Recursive(root.left, key);
// val is less than root's key
return search_Recursive(root.right, key);
}
}
class Main{
public static void main(String[] args) {
//create a BST object
BST_class bst = new BST_class();
/* BST tree example
45
/
10 90
/ /
7 12 50 */
//insert data into BST
bst.insert(45);
bst.insert(10);
bst.insert(7);
bst.insert(12);
bst.insert(90);
bst.insert(50);
//print the BST
System.out.println("The BST Created with input data(Left-root-right):");
bst.inorder();
//delete leaf node
System.out.println("nThe BST after Delete 12(leaf node):");](https://image.slidesharecdn.com/javacreateajavaapplicationusingthecodeexampleinthefollo-230330175226-3de8e43a/85/JavaCreate-a-java-application-using-the-code-example-in-the-follo-pdf-4-320.jpg)
JavaCreate a java application using the code example in the follo.pdf
- 1. Java: Create a java application using the code example in the following URL regarding a binary search tree structure: CODE EXAMPLE: class BST_class { //node class that defines BST node class Node { int key; Node left, right; public Node(int data){ key = data; left = right = null; } } // BST root node Node root; // Constructor for BST =>initial empty tree BST_class(){ root = null; } //delete a node from BST void deleteKey(int key) { root = delete_Recursive(root, key); } //recursive delete function Node delete_Recursive(Node root, int key) { //tree is empty if (root == null) return root; //traverse the tree if (key < root.key) //traverse left subtree root.left = delete_Recursive(root.left, key);
- 2. else if (key > root.key) //traverse right subtree root.right = delete_Recursive(root.right, key); else { // node contains only one child if (root.left == null) return root.right; else if (root.right == null) return root.left; // node has two children; //get inorder successor (min value in the right subtree) root.key = minValue(root.right); // Delete the inorder successor root.right = delete_Recursive(root.right, root.key); } return root; } int minValue(Node root) { //initially minval = root int minval = root.key; //find minval while (root.left != null) { minval = root.left.key; root = root.left; } return minval; } // insert a node in BST void insert(int key) { root = insert_Recursive(root, key); } //recursive insert function
- 3. Node insert_Recursive(Node root, int key) { //tree is empty if (root == null) { root = new Node(key); return root; } //traverse the tree if (key < root.key) //insert in the left subtree root.left = insert_Recursive(root.left, key); else if (key > root.key) //insert in the right subtree root.right = insert_Recursive(root.right, key); // return pointer return root; } // method for inorder traversal of BST void inorder() { inorder_Recursive(root); } // recursively traverse the BST void inorder_Recursive(Node root) { if (root != null) { inorder_Recursive(root.left); System.out.print(root.key + " "); inorder_Recursive(root.right); } } boolean search(int key) { root = search_Recursive(root, key); if (root!= null) return true; else return false; }
- 4. //recursive insert function Node search_Recursive(Node root, int key) { // Base Cases: root is null or key is present at root if (root==null || root.key==key) return root; // val is greater than root's key if (root.key > key) return search_Recursive(root.left, key); // val is less than root's key return search_Recursive(root.right, key); } } class Main{ public static void main(String[] args) { //create a BST object BST_class bst = new BST_class(); /* BST tree example 45 / 10 90 / / 7 12 50 */ //insert data into BST bst.insert(45); bst.insert(10); bst.insert(7); bst.insert(12); bst.insert(90); bst.insert(50); //print the BST System.out.println("The BST Created with input data(Left-root-right):"); bst.inorder(); //delete leaf node System.out.println("nThe BST after Delete 12(leaf node):");
- 5. bst.deleteKey(12); bst.inorder(); //delete the node with one child System.out.println("nThe BST after Delete 90 (node with 1 child):"); bst.deleteKey(90); bst.inorder(); //delete node with two children System.out.println("nThe BST after Delete 45 (Node with two children):"); bst.deleteKey(45); bst.inorder(); //search a key in the BST boolean ret_val = bst.search (50); System.out.println("nKey 50 found in BST:" + ret_val ); ret_val = bst.search (12); System.out.println("nKey 12 found in BST:" + ret_val ); } }