What is Polymorphism, overloading, overriding and virtual?
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what are the different ways for a method to be overloaded?
Difference between encapsulation and data hiding ?
What do you mean by data hiding?
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Explain about inheritance in oops?
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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?
Describe the Diamond problem. Where does this problem occur?
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What is garbage collection(gc)?