What is data abstraction? what are the three levels of data abstraction with Example?
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What is a nested interface?
Explain the mechanism of composition?
What are the major differences between late and dynamic binding?
Is class an Object? Is object a class?
How does abstraction differ from encapsulation.
What is Overloading ? Is it similar to overriding ?
Why is class hierarchies managed in object-oriented programming?
What is the difference between new and override?
What is super keyword?
Can we have default method with same name and signature in the derived interface as the static method in base interface and vice versa?
Can you create an instance of an interface?
Can we override static methods of a class?
Design Patterns 
