Can an interface be final java marker interface job interview question

Опубликовано: 13 Сентябрь 2024
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Can an interface be final ? Java Marker Interface ? Job Java Interview Questions

Can an interface be final ?

No,an interface cannot be final ,the compiler will have the following error.

Illegal modifier for the interface finalInterface; only public & abstract are permitted

What is a Marker Interface?

An interface which does not have any declaration inside but still enforces a mechanism.
Marker interface is used as a added to inform a message to the java compiler so that it can add special behavior to the class implementing it.
Examples :
java.io.Serializable
java.lang.Cloneable
java.util.EventListener
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