Marker interfaces

[shyam prasad nandigam]

hi to all..
can any one define what are marker interfaces with a real time example...
i had studied some where that interface with blank body are called marker interfaces..
but Runnable interface contains one abstract method even though it is called a marker interface
in Remote interface they are no methods declarations...in the same way Serializable interface also doesn't contain any methods.. but how when we implement them our class object gets some special behavior?

[Harshit Rastogi]

marker interface doesnt implement methods. Basically marker interface is used to add a new property to the object, like serializable.
so when you implement these interface then that specific property is set for all objects for that class and the behaviour is same for all objects and cannot be change on demand basis.when JVM finds the marker interface it knows what to do with that object and doesnt wait for any logic to be formed on it like in case of cloneable interface.