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Abstract Class vs. Interface in Java

In Java, an abstract class is a class that cannot be instantiated on its own and may contain concrete methods along with abstract methods. On the other hand, an interface is a blueprint of a class and can only have abstract methods and constants.

Key Differences:

• An abstract class can have abstract and non-abstract methods while an interface can only have abstract methods.
• A class can extend only one abstract class, but it can implement multiple interfaces.
• An abstract class may have instance variables, constructors, and member methods visibility control, unlike an interface.

Scenarios for Using Each:

Use an abstract class when you want to provide a common yet partial implementation to derived classes and have shared state or code among them. Use an interface when you want to specify a set of methods that a class must implement, irrespective of the class hierarchy.

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