Difference between abstract classes and interfaces in Java (Core Java Interview Question

In this session, I have and practically demonstrated about different differences between abstract classes and interfaces in Java. abstract classes are about partial abstraction, while interfaces are about full abstraction. abstract classes can contain both abstract and non-abstract methods. Methods created inside the interface are by default abstract. Starting from Java 8, interfaces can have default methods (with a default implementation) and static methods. From Java 9 onwards, interfaces can also have private methods. Objects cannot be created for both abstract classes and interfaces. We can create child classes for abstract classes using extends keyword. We can create child classes for interfaces using implements keyword. We can create constructors inside abstract classes, but cannot create constructors inside an interface. Variables inside abstract classes are normal variables. Variable created inside the interface are by by default final and static type, can only contain static final constants (implicitly public, static, and final). Abstract classes are used for shared code among closely related classes. Interfaces are used to define capabilities that can be implemented by any class, even if they are not related. With theoretical and practical demonstration in Java, I have covered all the above concepts.
What is the difference between abstract classes and interfaces in Java (Core Java Interview Question #499)
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