What is a nested interface?
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What are the access modifiers?
Explain serialization and overriding?
Difference: 'uses', 'extends', 'includes'
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Can you create an instance for an abstract class?
Why abstraction is important?
What is a default method? Why do we need default methods in java 8 interfaces?
Define Data Abstraction. What is its importance?
What is bootstrap, extension and system class loader?
What is garbage collection(gc)?
What is the difference between abstract & interface?
Is class an Object? Is object a class?
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What is the practical implementation of inner classes?