//********************************************************************//  ListADT.java       Authors: Lewis/Chase////  Defines the interface to a general list collection. Specific//  types of lists will extend this interface to complete the//  set of necessary operations.//********************************************************************package jss2;import java.util.Iterator;public interface ListADT<T>{   /**  Removes and returns the first element from this list */   public T removeFirst ();   /**  Removes and returns the last element from this list */   public T removeLast ();   /**  Removes and returns the specified element from this list */   public T remove (T element);   /**  Returns a reference to the first element on this list */   public T first ();   /**  Returns a reference to the last element on this list */   public T last ();   /**  Returns true if this list contains the specified target element */   public boolean contains (T target);   /**  Returns true if this list contains no elements */   public boolean isEmpty();   /**  Returns the number of elements in this list */   public int size();   /**  Returns an iterator for the elements in this list */   public Iterator<T> iterator();   /**  Returns a string representation of this list */   public String toString();}