泛型的通配符

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http://stackoverflow.com/questions/14346622/list-vs-list-extends-object

http://stackoverflow.com/questions/8055389/whats-the-difference-between-and-extends-object-in-java-generics

http://stackoverflow.com/questions/12340808/whats-the-difference-between-listobject-and-list

这仨帖子讲泛型的通配符讲的太好了

泛型的通配符

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原文地址：http://my.oschina.net/u/2291753/blog/465458