All you need to do is create an interface that describes the abstract behavior the Collection should provide.

只需创建一个接口，用它描述Collection应该提供的抽象行为。

youdao

All you need to do is create an interface that describes the abstract behavior the Collection should provide.

只需创建一个接口，用它描述Collection应该提供的抽象行为。

youdao