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<What is the difference between an Abstract Class and an Interface? ⁄ >




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For a number of Java newbies, the only difference between two is, "You can't have method body in Interface.". Well, I would say that it is technically (Implementation vise) correct, but doesn't reflect the concept.

Abstract Class

An abstract class, is the most generalized form of an Entity hierarchy (In Java, a Class is an entity), such that it doesn't represent a real entity on its own, but provides a basis on which real entities can be build within that hierarchy. An abstract class provides a default behavior and also provide abstract behavior (Operations that must be override by the real classes).

Interface

An interface, on the other hand is a contract that states that you have to agree to provide following operations if you agree to abide by me, i.e. an entity that agrees to abide by the contract of interface, will have to provide the behavior (operations) declared in interface.



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