What is @functionalinterface?
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What is the difference between aggregation and composition?
What is the difference between class and interface?
Explain the abstract class modifier?
What is single and multiple inheritance?
Can you think of some nice examples where *multiple* actors are associated with a use case ?
Difference Between Attribute and Association.
What is difference between class and interface?
What is a try/ catch block?
What is data encapsulation and what is its significance?
What is multiple inheritance? How java 8 supports multiple inheritance?
What is the practical implementation of inner classes?
How to achieve data abstraction?