Homework 8 Solution

Below is my solution for the Binary Search Tree:

public class BinarySearchTree {

 private BinarySearchTree left;
 
 private BinarySearchTree right;
 
 private int data;
 
 public BinarySearchTree() {
  left = null;
  right = null;
 }
 
 /** Create a tree that consists of just one node with no children. */
 public BinarySearchTree(int data) {
  left = null;
  right = null;
  this.data = data;
 }
 
 /** Adds new number n to this BinarySearchTree, placing it in its correct place.
  * 
  * @param n the number to be added
  */
 public void add (int n) {
  if (n <= data) {
   if (left != null) 
    left.add(n);
   else 
    left = new BinarySearchTree(n);
  }
  else { // n > data
   if (right != null) 
    right.add(n);
   else 
    right = new BinarySearchTree(n);
  }
 }
 
 /** Returns the maximum number in this tree. */
 public int max() {
  if (right == null)
   return data;
  return right.max();
 }
 
 /** Returns the height of this tree. */
 public int height() {
  //The base cases are when a child is null.
  return 1 + Math.max((left == null ? 0: left.height()), 
       (right == null ? 0: right.height()));
 }
}