//Zachary Fitzsimmons
import java.util.LinkedList;
public class Num21
{
   public int countZeroes(ListNode head)
   {
     int count;
     for(ListNode node = head; node.getNext() != null; node = node.getNext())
       if(node.getValue() == 1)
         count++;
     return count;
   }
}
//Zachary Fitzsimmons
import java.util.LinkedList;
public class MyLinkedList
{
   private ListNode head;
   public void remove(Object obj)
   {
     for(ListNode node = head; node.getNext().getNext() != null; node = node.getNext())
       if(node.getNext().getValue().equals(obj))
         node.setNext(node.getNext().getNext());
   }
}
/**
 * Write a description of class Iterator here.
 * 
 * @author (your name) 
 * @version (a version number or a date)
 */
public class Iterator
{
	// instance variables - replace the example below with your own
	private int x;

	/**
	 * Constructor for objects of class Iterator
	 */
	public Iterator()
	{
		// initialise instance variables
		x = 0;
	}

	/**
	 * An example of a method - replace this comment with your own
	 * 
	 * @param  y   a sample parameter for a method
	 * @return     the sum of x and y 
	 */
	public int sampleMethod(int y)
	{
		// put your code here
		return x + y;
	}
}

//Zachary Fitzsimmons
import java.util.LinkedList;
public class MyDoubleLinkedList
{
   private LIstNode2 head, tail;
   public Object removeFirst()
   {
     if(head == tail)
       throw UnsupportedOperationException();
     Object temp;
     ListNode2  node = head;
     temp = node.getValue();
     node.setNext(node.getNext().GetNext());
     node = node.getNext().getNext();
     node.setPrevious(node.getPrevious().getPrevious());
     return temp;
   }
}
//Zachary Fitzsimmons
import java.util.LinkedList;
public class Num25
{
   public void fixBackLinks()
   {
     
   }
}
//ZAchary Fitzsimmons
import java.util.LinkedList;
public class MyDoublyLInkedListWithHeader
{
   private ListNode2 header;
   public void insertInOrder(Integer x);
}