Explain about message passing in object oriented programming?
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Which OOPS concept exposes only the necessary information to the calling functions?
Explain about a class?
What does it mean that a method or class is abstract?
What does the “abstract” keyword mean in front of a method? A class?
Is class an Object? Is object a class?
Differentiate between data abstraction and encapsulation.
What is the difference abstract class and interface?
When do you prefer to use composition than aggregation?
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What is operator overloading?
State about java and its relation to object oriented programming?
How many instances can be created for an abstract class?
Which keyword can be used for overloading?
Design Patterns 
