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Java 8 Interview Questions and Answers

Question: What are functional interfaces?
Answer:
  • Functional interfaces are those interfaces which can have only one abstract method. It can have static method, default methods or can override Object’s class methods.
  • There are many functional interfaces already present in java such as Comparable, Runnable.
  • As we have only one method in Runnable, hence it is considered as functional interface.
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