collection - 为什么Java集合框架要用内部类迭代器的设计来实现读取操作？

Answer 1

First statement:

• Map does not implement the Collection interface

• Collection means that this is a collection, that is, the interface of the collection is defined

• Iterator is the interface for traversing collections

Answer:

To reduce coupling. Iterator also needs to be reused as a component, not just used in the Collection interface.