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import java.util.*;

/**

* Description:

* <br/>网站: <a href="http://www.crazyit.org">疯狂Java联盟</a>

* <br/>Copyright (C), 2001-2016, 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 GenericList

{

public static void main(String[] args)

{

// 创建一个只想保存字符串的List集合

List<String> strList = new ArrayList<String>(); // ①

strList.add("疯狂Java讲义");

strList.add("疯狂Android讲义");

// 下面代码将引起编译错误

strList.add(5); // ②

strList.forEach(str -> System.out.println(str.length())); // ③

}

}