/*
Research Project:   Graphical Database for Category Theory
                    J. Bradbury, Dr. R. Rosebrugh, I. Rutherford
                    Mount Allison University 2001
File:               Queue.java
                    (author: ????, Auburn University)
Description:	      Class to implement a simple queue of integers.
*/

  //Import statement
  import java.util.Vector;

  public class Queue
  {
   private static int size;
   Vector array;

   public Queue()
     {
      array = new Vector();
     }

   public int push(int item)
     {
      int num;
      array.addElement(new Integer(item));
      num = array.size();
      return num;
     }

   public int pop()
     {
      int item;
      item = ((Integer)array.elementAt(0)).intValue();
      array.removeElementAt(0);
      return item;
     }

   public boolean isEmpty()
     {
      return(array.isEmpty());
     }
  }