Nested interfaces in Java

We can declare an interface within another interface or class. Such interfaces are called nested interfaces.

The following are the rules for managing nested interfaces.

• The interface within the declared nested interface interface must be public.
• Nested interfaces declared within a class can have any access modifier.
• Nested interfaces are static by default.

The following is an example of nested interfaces.

Example

Live Demonstration

class Animal {
   interface Activity {
      void move();
   }
}
class Dog implements Animal.Activity {
   public void move() {
      System.out.println("Dogs can walk and run");
   }
}
public class Tester {
   public static void main(String args[]) {
      Dog dog = new Dog();
      dog.move();
   }
}

Output

Dogs can walk and run

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