Can anyone explain what is the need of marker interface??

Question

Marker interface in java has no methods then what is use of it??

Answer 1

Even though there are no methods, but the presence of these interfaces affect the runtime behaviour of these object which inherit them.
In more modern Java, the same concept is usually expressed by using annotations.

More details:
https://www.baeldung.com/java-marker-interfaces

Answer 2

Sololearner may not perform well for this or even affect other activities, but it has the
https://play.google.com/store/apps/details?id=com.serakont.appbuilder2 where you can make your interface or even publish your app

It's a little difficult but if you understand visual studio you can use it without any problems.