If a Marker Interface does not have any methods, how does it work?

Question

I am aware of what marker interface is and when we need to use it. One question is still not clear to me. If a marker interface does not have any method or body, how does

Answer 1

Marker interface in Java is interfaces with no field or methods or in simple word empty interface in java is called marker interface. e.g. serializable, Clonnable and Remote Interface. They are used to indicate signal or command to the compiler Or JVM. It can also be used to classify code. You can also write your own marker interface and use them to logically divide your code. Also, you can write any pre-processing operation on those class.