--question #1
require: BST.java Node.java Question1.java
compile : javac Question1.java
run : java Question1

--question #2
require: Heap.java Question2.java
compile : javac Question2.java
run : java Question2

import java.awt.HeadlessException;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

/**
*
* @author
*/
public class Question1 extends JFrame {

private JScrollPane jScrollPane1;
private JTextArea textArea;

/**
* constructor
* @param mes string to be showed
* @throws HeadlessException
*/
public Question1(String mes) throws HeadlessException {
   super("Question 1");
   textArea = new JTextArea(mes);
   jScrollPane1 = new JScrollPane(textArea);

   add(jScrollPane1);
   pack();
   setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   setVisible(true);
}

/**
* main function
* @param args
*/
public static void main(String[] args) {
   Object[] options = {"Read from file",
         "Generate numbers"};
   int n = JOptionPane.showOptionDialog(null,
            "What action do you want to take?",
            "Question 1",
            JOptionPane.YES_NO_OPTION,
            JOptionPane.QUESTION_MESSAGE,
            null,
            options,
            options[0]);

   BST bst ;

   if (n == 0) {
         bst = fromFile();
   } else {
         bst = generate();
   }

   int k = 0;
   try {
         String num = JOptionPane.showInputDialog(null,
                     "Ente k value: ");
            k = Integer.parseInt(num);
   } catch (Exception e) {
         k = 0;
   }

   String mes = "";
   mes += "Height of the binary search tree "
            + bst.height() + System.lineSeparator();
   ArrayList<Integer> al = bst.k_smallest(k);

   mes += k + "th smallest element: " + al.toString()
            + System.lineSeparator();

   Object[] options1 = {"Ascending",
         "Descending"};
   n = JOptionPane.showOptionDialog(null,
            "Which order of input do you want to show?",
            "Question 1",
            JOptionPane.YES_NO_OPTION,
            JOptionPane.QUESTION_MESSAGE,
            null,
            options1,
            options1[0]);

   ArrayList<Integer> ll;
   if (n == 0) {
         ll = bst.ascending();
         mes += "Ascending order: ";
   } else {
         ll = bst.descending();
         mes += "Ascending order: ";

Imagine that we have developed a Stack to hold double values with t...