Java Interface

The following are the key points about java Interface.

  • In Interface, all the members are implicitly abstract methods.
  • Interface contains only abstract methods.
  • All the variables in the Interface are implicitly static final variables.
  • Interface is only the reference. We cannot create an object for an Interface.
  • Interface achieves multiple Inheritance.
  • Interface achieves loose coupling of code.
  • Interface involves in designing a good code.
  • Interface avoids unnecessary codes to the client.
  • The main purpose of Interface is not to reveal the unwanted information to the client.
  • Interface is only meant for maintainability. Nothing to do with performance.
  • When you implement an interface method, it must be declared as public.

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