bilineariteratoruos.java

国外的数据结构与算法分析用书

/* BilinearIteratorUos.java
 * ---------------------------------------------
 * Copyright (c) 2001 University of Saskatchewan
 * All Rights Reserved
 * --------------------------------------------- */
 
package dslib.base;

import dslib.exception.BeforeTheStartUosException;

/**	An Iterator which has routines to move forward and back, 
	and to the first and last items of a collection.  It keeps track of 
	the current item, and also has routines to determine if it is 
	before the start or after the end of the collection. */
public interface BilinearIteratorUos extends LinearIteratorUos
{
  
	/**	Go to last item of the data structure. */
	public void goLast();
 
	/**	Move back one item in the data structure. <br>
		PRECONDITION: <br>
		<ul>
			!before()
		</ul> */
	public void goBack() throws BeforeTheStartUosException;
 
}