Use the following file:

TreePrintDemo.java

import java.util.Scanner;

/**
   A program for demonstrating printing of the BinarySearchTree class.
*/
public class TreePrintDemo
{  
   public static void main(String[] args)
   {
      Scanner in = new Scanner(System.in);
      BinarySearchTree t = new BinarySearchTree();

      boolean done = false;
      while (!done)
      {             
         System.out.println("Enter a word or a blank line to quit:");
         String input = in.nextLine();
         if (input.length() == 0)
            done = true;
         else
            t.add(input);
      }
      
      done = false;
      while (!done)
      {
         System.out.println("P)reorder, I)norder, pO)storder, Q)uit:");
         String input = in.nextLine().toUpperCase();
         if (input.equals("Q"))
            done = true;
         else if (input.equals("P"))
            t.printPreOrder();
         else if (input.equals("I"))
            t.print();
         else if (input.equals("O"))
            t.printPostOrder();
      }
   }
}