diff between Interface and Abstract Class ?

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Accepted Answer

Interface is a contract that defines the methods a class must implement, while abstract class can have both implemented and abstract methods.

Interface can only have abstract methods and constants, while abstract class can have abstract and non-abstract methods.
A class can implement multiple interfaces but can only inherit from one abstract class.
Interfaces are used to achieve multiple inheritance in Java, while abstract classes are used to provide a common base for subclasses.
Interfaces are implicitly abstract and cannot have method implementations, while abstract classes can have method implementations.
Example: Interface - Runnable, Abstract Class - Animal with abstract method 'eat' and non-abstract method 'sleep'.

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