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

A marker interface tells JVM that the class being marked by marker interface to add functionality of a marker interface . Like implementing Cloneable tells JVM that this class implements Cloneable and hence JVM will have to copy it bit-wise.