BSTree Class Overview

BSTree Class

• The BSTree class implements the BTNode interface and represents a binary search tree (BST).
• It has three private fields: left, right, and value.
• left and right refer to the left and right children of the node, respectively.
• value stores the integer value of the node.

Constructor

• The constructor initializes a new BSTree node with a given value and sets left and right to null, indicating that the node has no children initially.

Getters and Setters

• The class provides getter methods getValue(), getLeft(), and getRight() to access the node's value, left child, and right child, respectively.
• It also has setter methods setLeft(BTNode node) and setRight(BTNode node) to modify the left and right children of the node.

Adding a Node (addNode)

• The addNode(BTNode node, int value) method adds a new node with the given value to the BST.
• It starts at the given node as the root and recursively compares the value to be added with the current node's value.
• If value is less than the current node's value, the method searches the left subtree recursively.
• If value is greater than or equal to the current node's value, the method searches the right subtree recursively.
• If the appropriate child of the current node is null, a new BSTree node with the given value is created and attached as the child.

Searching for a Value (search)

• The search(BTNode node, int value) method searches for a node with the given value in the BST.
• It begins at the given node as the root and recursively traverses the tree.
• If the current node is null, the value is not in the BST, and the method returns false.
• If the current node's value is equal to the value, the method returns true, indicating that the value has been found.
• If the value is less than the current node's value, the method searches the left subtree recursively.
• If the value is greater than the current node's value, the method searches the right subtree recursively.

Converting BST to List (toList)

• The toList(BTNode node, ArrayList result) method recursively traverses the BST in an in-order traversal.
• For each node:
  • It recursively visits the left subtree.
  • It adds the node's value to the result ArrayList.
  • It recursively visits the right subtree.
• This method converts the contents of the BST into a sorted ArrayList.

This quiz focuses on the BSTree class, implementing the BTNode interface. Participants will explore its constructor, methods, and how to add nodes to the binary search tree. Test your understanding of binary trees and their structures.