BSTree Class Overview

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Questions and Answers

What will happen if you attempt to add a node with a value less than the current node's value and the left child is not null?

  • An error will be thrown.
  • The new node will be added to the right subtree.
  • The new node will be added to the left subtree. (correct)
  • The new node will replace the current node's left child.

What value is returned by the search method if the value is not found in the binary search tree?

  • The current node's value.
  • False. (correct)
  • True.
  • Null.

What is the purpose of the toList method in the BSTree class?

  • To add nodes to the binary search tree.
  • To search for a specific value in the binary search tree.
  • To display the tree structure in a console.
  • To convert the binary search tree into a sorted array list. (correct)

What condition is checked to determine whether to search the left or right subtree during the search operation?

<p>If the value is less than or greater than the current node's value. (B)</p> Signup and view all the answers

If a BSTree object is created with the value 10, what will the value of the left child be immediately after instantiation?

<p>Null. (A)</p> Signup and view all the answers

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Study Notes

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.
  • 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.

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