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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), 2001-2012, 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 RightTest

{

// 声明一个泛型方法，该泛型方法中带一个T形参

static <T> void test(Collection<? extends T> from , Collection<T> to)

{

for (T ele : from)

{

to.add(ele);

}

}

public static void main(String[] args)

{

List<Object> ao = new ArrayList<>();

List<String> as = new ArrayList<>();

// 下面代码完全正常

test(as , ao);

}

}