Answer Posted / ramesh.m

1)By implementing for interface,our object can get some
ability such type interfaces called as "marker/ability/tag
interfaces".

Ex:
By implementing Serializable interface,our objects can able
to travel across network and can able to save the file
persistently.

2)If any interface does not contain any methods, it is
always called "marker interface".

Ex:
Serializable ,Clonable,RandomAccess,SingleThreadModel.

in these cases,JVM will provide required ability
automatically.

3)Even though interface contains methods by implementing
that interface if our objects will get some ability still we
can consider it as marker interface.

Ex:
Comparable [compareTo()method],Runnable[run() method] etc.

in these cases,required ability should be provided by
programmer.

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