what is the need of interface????????

[rahul mehra]

why is interface needed in java.... if we say that any class which implememnts a particular interface has the flexibility to define its method in its own way..then we might as well as declare a class with the required method....


why do we need to define an interface.... ???


can anybody give me the basic idea.....

[Ulf Dittmer]

The Sun Java Tutorial has a section on interfaces and inheritance. It explains why and when you might want to use them

[sudhir nim]

Interfaces are used to define contract,
They are also used to achieve runtime polymorphism.