testiteratorerror.java

疯狂Java讲义_源码(含Java设计模式CHM

import java.util.*;
/**
 * Description:
 * <br/>Copyright (C), 2005-2008, Yeeku.H.Lee
 * <br/>This program is protected by copyright laws.
 * <br/>Program Name:
 * <br/>Date:
 * @author  Yeeku.H.Lee [e-mail]
 * @version  1.0
 */
public class TestIteratorError
{
	public static void main(String[] args) 
	{
		//创建一个集合
		Collection books = new HashSet();
		books.add("轻量级J2EE企业应用实战");
		books.add("Struts2权威指南");
		//获取books集合对应的迭代器
		Iterator it = books.iterator();
		while(it.hasNext())
		{
			String book = (String)it.next();
			System.out.println(book);
			if (book.equals("Struts2权威指南"))
			{
				//使用Iterator迭代过程中，不可修改集合元素,下面代码引发异常
				books.remove(book);
			}
		}
	}
}