Interface can have state??

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I thought that an interface only contains behavior and cannot contain state. If this is correct, is String NAME not considered state?

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Sela

Level 20 , Poland

17 July 2020, 13:22

it may not be considered as object's state because it is static by default meaning exists before even object was created

Alexander Shtunder

Level 41 , San Francisco, USA

14 August 2019, 10:06

All fields in the interface are public static final, that is, they are constants. Therefore, if your String NAME is not a constant, it is undesirable to use it in the interface.

Jay

Level 17 , Washington, United States

14 August 2019, 12:55

So, legal but not best practice?

Alexander Shtunder

Level 41 , San Francisco, USA

16 August 2019, 07:33

All right

Johannes

Level 27 , Centurion, Pretoria, South-Africa

22 March 2020, 07:26

Sorry, you're not making sense to me ? (I am the one not understanding, it's not you). NO fields in "SimpleObject" are marked as "public" or as "static" or as "final" ? And in "Button", the String is declared as "final", yes, but not public or static. Why does that make a difference ? Please explain ? Why can I even declare String again (it's already defined in the parent interface), and why do I need to have a method with an object, if it's not an abstract interface ? This stuff keeps making no sense, no matter how many examples I complete.

Sela

Level 20 , Poland

17 July 2020, 13:15

declaring the same name of field in subclass (or child interface) as in superclass, so superclass field is hidden means field hiding and is almost always a sign of bad code. you may console yourself with this.

Sela

Level 20 , Poland

17 July 2020, 13:27

and it is still interface meaning abstract data type although having a parent