参考答案
Collection 定义了集合类的基本方法，是JDK中集合层次结构中的最根本的接口。
源码中的解释：
* The root interface in the <i>collection hierarchy</i>. A collection * represents a group of objects, known as its <i>elements</i>. Some * collections allow duplicate elements and others do not. Some are ordered * and others unordered. The JDK does not provide any <i>direct</i> * implementations of this interface: it provides implementations of more * specific subinterfaces like <tt>Set</tt> and <tt>List</tt>. This interface * is typically used to pass collections around and manipulate them where * maximum generality is desired.
Collections 是一个包装类。
它包含了各种有关集合操作的静态多态方法，不能实例化，Collection 集合框架的工具类。
* This class consists exclusively of static methods that operate on or return * collections. It contains polymorphic algorithms that operate on * collections, "wrappers", which return a new collection backed by a * specified collection, and a few other odds and ends.
以上，是Java面试题【Collection和Collections有什么区别】的参考答案。
输出，是最好的学习方法。
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