How to write our own marker interface in Java?

Question

I know marker interface in java. It is used to define a specific behaviour about a class. For example, Serializable interface has the specific ability to store an object into by

Answer 1

As far as I know marker interfaces get their behaviour by "utility" classes. For example if you have read the Design Patterns book by the Gang of Four, you have behaviour of a class tagged with a marker interface defined in another class.

For example you have a marker interface "Saveable". You have a process that traverses all classes implementing this interface (via reflection) and then does save operation on it.