javainterfacenested-class

Nested class inside an interface

The java compiler allows me write a Class definition inside an Interface . Are there any specific uses of this ?

interface ClassInterface {

  void returnSomething();
  int x = 10;

  class SomeClass {
    private int y;

    private void classDoingSomething() {         
    }
  }
}

Please explain .

Solution

  • Yes Java allows you to define an inner class inside an interface One use I can think of is tightly binding a certain type (defined by the class) to an interface and perhaps limit access only to the interface methods. There's an example of such use on here