CHAPTER 17

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Interfaces

In this chapter, you will learn

  • What interfaces are
  • How to declare interfaces
  • How to declare abstract, default, and static methods in interfaces
  • How to fully and partially implement interfaces in a class
  • How to evolve interfaces after they are published
  • How to inherit an interface from other interfaces
  • Using the instanceof operator with interfaces
  • What marker interfaces are
  • How interfaces can be used to implement polymorphism
  • How dynamic binding applies to method calls on interface type variables

What Is an Interface?

The interface is a very important concept in Java programming. The knowledge of a Java developer is incomplete ...

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