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Collection 是一个集合接口
它提供了对集合对象进行基本操作的通用接口方法Collection接口在Java 类库中有很多具体的实现是listset等的父接口
Collections 是一个包装类
它包含有各种有关集合操作的静态多态方法此类不能实例化就像一个工具类服务于Java的Collection框架
日常开发中不仅要了解Java中的Collection及其子类的用法还要了解Collections用法可以提升很多处理集合类的效率
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