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Give any criteria when you use an abstract class and an interface?
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What is a default method? Why do we need default methods in java 8 interfaces?
What is single and multiple inheritance?
What do you mean by abstract classes?
Can an interface have an inner class?
What interface must an object implement before it can be written to a stream as an object?
Explain the rationale behind object oriented concepts?
Which OOPS concept exposes only the necessary information to the calling functions?
Explain the mechanism of composition?
Explain serialization and overriding?
What is method overriding?
Can we reduce the visibility of the inherited or overridden method ?
Can link and Association applied interchangeably?
Design Patterns 
