一、单例简介
单例模式是在软件开发中经常用的一种模式。单例模式通俗的理解是，在整个软件生命周期内，一个类只能有一个实例对象存在。
二、遇到的问题
在平时开发使用单例的过程中，有时候会有这样的需求，在用户登录成功时，将用户的信息记录在用户信息单例中，当用户退出登录后，因为这个用户单例的指针被静态存储器的静态变量引用着，导致用户单例不能释放，直到程序退出或者杀死后，内存才能被释放。那有没有一种方法能够在单例不需要的时候就释放掉，而不要等到App结束呢？下面就介绍一种可以销毁的单例。
三、代码
说的再多不如一句代码来的实在，直接上代码。
单例类如下所示：
http://www.chem17.com/Tech_news/Detail/1182901.html
http://www.chem17.com/Tech_news/Detail/1182902.html
http://www.chem17.com/Tech_news/Detail/1182903.html
http://www.chem17.com/Tech_news/Detail/1182904.html
http://www.chem17.com/Tech_news/Detail/1182905.html
http://www.chem17.com/Tech_news/Detail/1182906.html
http://www.chem17.com/Tech_news/Detail/1182908.html
http://www.chem17.com/Tech_news/Detail/1182909.html
http://www.chem17.com/Tech_news/Detail/1182915.html
http://www.chem17.com/Tech_news/Detail/1182916.html
http://www.chem17.com/Tech_news/Detail/1182921.html
http://www.chem17.com/Tech_news/Detail/1182919.html
http://www.chem17.com/Tech_news/Detail/1182924.html
http://www.chem17.com/Tech_news/Detail/1182928.html
http://www.chem17.com/Tech_news/Detail/1182930.html
http://www.chem17.com/Tech_news/Detail/1182933.html
http://www.chem17.com/Tech_news/Detail/1182934.html
http://www.chem17.com/Tech_news/Detail/1182939.html
http://www.chem17.com/Tech_news/Detail/1182940.html
http://www.chem17.com/Tech_news/Detail/1182943.html
http://www.chem17.com/Tech_news/Detail/1182944.html
http://www.chem17.com/Tech_news/Detail/1182945.html
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