A & DS: Exercises from Friday

Exercise. Make a binary search tree node class.

public class BSTNode {
    ...
    int key
    BSTNode left;
    BSTNode right;
    ...
}  
Implement a BSTree class with insert and find methods.
public class BSTree {
    BSTNode root;
    void insert(int k) { ... }  // add a node with key k to the tree
    boolean find(int k) { ... } // determine whether key k is in the tree
}