public class TreeTest {
  public static void main(String[] args) {
    // this tree stores faculty salaries
    BinarySearchTreeNode<String, Integer> root = new BinarySearchTreeNode<>("Dan", 1);
    root.add("Jeannie", 200000);
    root.add("Steve", 300000);
    root.add("Kelly", 2);
    root.add("Rohit", 100000000);

    System.out.println(root);
    System.out.println(root.find("Iris"));
    System.out.println(root.contains("Rohit"));
    System.out.println(root.contains("Sam"));
  }
}