Marker Interfaces in java

Marker interface:

• The interfaces using which we explicitly mention or mark certain properties to the object are known as marker interface.
• An interface that is used to check / mark / tag the given object is of a specific type to perform a special operations on that object.
• Marker interfaces will not have methods , they are empty interfaces.

 Need of marker interface: 

• It i used to check , whether we can perform some special operations on the passed object
• For ex: using serializable  interface we can explicitly mention that object of a class is transferable. else it can not.
• If a class is deriving form java.lang.Cloneable interface then that object can be cloned, else it can not
• In side those particular methods , that method developer will check that the passed object is of type the given interface or not by using "instanceof" operator.

Predefined marker interfaces:

1. java.lang.Cloneable
2. java.io.Serializable
3. java.util.RandomAccess
4. java.util.Eventlistener
5. java.rmi.Remote
6. java.servlet.SingleThreadModel