What is the use if instanceof keyword?
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Is @functionalinterface annotation mandatory to define a functional interface? What is the use of @functionalinterface annotation? Why do we need functional interfaces in java?
Can different parts of a partial class inherit from different interfaces?
What is the difference between class and interface?
Explain about abstraction?
Is class an Object? Is object a class?
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Define Data Abstraction. What is its importance?
How many instances can be created for an abstract class?
Explain what is meant by polymorphism?
Define Destructor?
What are base class, sub class and super class?
what are the main underlying concepts of object orientation?
How to use CRC Cards for Class Design?