Advantage and Disadvantage of Interface

Interface:
 only know the customer requirement and don't know the implementation than go for interface.


Advantage:

• 100% abstract
• Multiple inheritance
• All variables are public static and final.
• all methods are abstract 

Disadvantage:

• can't have contractor
• can't serialized the object because you can't create the object of Interface.
• can't declare method as static , final, synchronized
• can't declare variable with private,protected,transient,volatile
• can't declare instance block or static block for interface.