作者：未知 来源：月光软件站 加入时间：2005-2-28　月光软件站

/**
 * @Author 陈伟兵
 * @Msn:[email protected]
 * @E-mail:[email protected]
 * @CreateTime 2004-11-30
 * @Version:1.0
 */
package com.cwbnig.util;

import java.util.Iterator;

public interface BagADT
{
    //Adds one element to this bag
    public void add(Object element);
   
    //Remove and returns a random element from the bag
    public Object removeRandom()throws EmptyBagException;
   
    //Removes and returns the specified element from this bag
    public Object remove(Object element)throws EmptyBagException,NoSuchElementException;

    //Returns the union of this bag and the parameter
    public BagADT union(BagADT set);
   
    //Returns true if this bag contains the parameter
    public boolean contains(Object target);
   
    //Returns true if this bag and the parameter contain exacitly the same elements
    public boolean isEmpty();
   
    //Returns the number of elements in this set
    public int size();
   
    //Returns an iterator for the elements in this bag
    public Iterator iterator();
   
    //Returns a string representation of this bag
    public String toString();
}

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