本文详细解释了Java泛型中< ? extends E > 和 < ? super E > 的含义及用法，阐述了它们在继承关系和类型约束上的区别。
What is the difference between <?
super E> and <?
extends E>?
The first says that it's "some type which is an ancestor of E"; the second says that it's "some type which is a subclass of E". (In both cases E itself is okay.)
扫一扫
评论
被折叠的 条评论
为什么被折叠?
到【灌水乐园】发言
查看更多评论
添加红包
