What is a default method? Why do we need default methods in java 8 interfaces?
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What is a static method? Why do we need static methods in java 8 interfaces?
What are abstract classes?
Every object has : state, behavior and identity - explain
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Explain about multiple inheritance?
Which OOPS concept exposes only the necessary information to the calling functions?
What is garbage collection(gc)?
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Why are outlet connections required in object-oriented programming?
What is difference between polymorphism and normalization?
What is the main use of message metaphor in object-oriented programming?
What are base class, sub class and super class?
Design Patterns 
