# Multiple classes in an (undefined) ArrayList?

**URL:** <https://discourse.processing.org/t/multiple-classes-in-an-undefined-arraylist/8291>\
**Category:** Beginners\
**Created:** [February 11, 2019, 7:14pm UTC](https://discourse.processing.org/t/multiple-classes-in-an-undefined-arraylist/8291 "2019-02-11T19:14:45Z")\
**Posts on this page:** 1\
**Showing post:** 11

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**Author:** ![GoToLoop](https://yyz2.discourse-cdn.com/flex036/user_avatar/discourse.processing.org/gotoloop/32/86_2.png) [@GoToLoop](https://discourse.processing.org/u/GoToLoop)\
**Post date:** [February 21, 2019, 5:28pm UTC](https://discourse.processing.org/t/multiple-classes-in-an-undefined-arraylist/8291/11 "2019-02-21T17:28:56Z")

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> [@needfulthing](#):
>
> If a class implements an `interface`, it must provide all the fields and …

Not the fields. Actually, any fields declared in an `interface` are implicitly `public`, `static` & `final`! 😶

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