Difference between abstraction and implementation hiding ?
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Can a class in java be inherited from more than one class?
why do requirements change so much? after all, don't people know what they want?
Explain serialization and overriding?
What are the different types of inheritance?
What is the difference between oop and sop?
Do we require a parameter for constructors?
Is @functionalinterface annotation mandatory to define a functional interface? What is the use of @functionalinterface annotation? Why do we need functional interfaces in java?
Explain colloboration
How do you prevent a class from being inherited by another class?
What are the methods required to create changes in subclasses?
Can you think of some nice examples where *multiple* actors are associated with a use case ?
What is operator overloading and polymorphism?
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Design Patterns 
