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 kongyeeku@163.com
 * @version  1.0
 */
public class ListErr
{
	public static void main(String[] args) 
	{
		//創建一個只想保存字符串的List集合
		List strList = new ArrayList();
		strList.add("Struts2權威指南");
		strList.add("基于J2EE的Ajax寶典");
		strList.add("輕量級J2EE企業應用實戰");
		//”不小心“把一個Integer對象”丟進"了集合
		strList.add(5);
		for (int i = 0; i < strList.size() ; i++ )
		{
			//因為List里取出的全部是Object，所以必須強制類型轉換
			//最后一個元素將出現ClassCastException異常
			String str = (String)strList.get(i);
		}
	}
}