Java集合框架
最近一直在看 Collection Framework
，一些总结和疑问我就自己归纳到这个文章做个记录，如果你知道答案欢迎回复讨论吖
集合应该就是存放一组元素的抽象概念，所以集合应该拥有存放和获取元素这样的基本操作，而不同的集合接口对应着不同方式的存放或者获取场景，以及一些特殊需求，比如阻塞，导航等
总结：
- 集合框架接口的类图
- 集合框架接口的关系说明图
疑问：
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为什么很多子类接口还要再次重写一次父类接口，完全一模一样？这是什么设计用意？比如
List接口前几个方法都是Collection父类有的，但是还是要重写一次 -
为什么
Collection接口中，添加方法为什么用的泛型，但是删除方法，包含方法不是，用的是Object？这是什么设计用意？其他接口也看到类似的处理
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