listadt.java

一个普通的计算器程序

//********************************************************************
//  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();
}