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import java.lang.ref.*;

/**

* 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 ReferenceTest

{

public static void main(String[] args)

throws Exception

{

//创建一个字符串对象

String str = new String("疯狂Java讲义");

//创建一个弱引用，让此弱引用引用到"疯狂Java讲义"字符串

WeakReference wr = new WeakReference(str); //①

//切断str引用和"疯狂Java讲义"字符串之间的引用

str = null; //②

//取出弱引用所引用的对象

System.out.println(wr.get()); //③

//强制垃圾回收

System.gc();

System.runFinalization();

//再次取出弱引用所引用的对象

System.out.println(wr.get()); //④

}

}