The right operand of instanceof may be an interface. : instanceof Operator « Operators « SCJP

1. SCJP
2. Operators
3. instanceof Operator

//The test determines whether the object at the left argument implements the specified interface.


public class MainClass {
  public static void main(String[] argv) {
    MyClass myObject = new MyClass();

    if (myObject instanceof MyInterface) {
      System.out.println("myobject is an instance of MyInterface");
    }

  }
}

interface MyInterface {

  public void myMethod();
}

class MyClass implements MyInterface {

  public void myMethod() {
  }

}

myobject is an instance of MyInterface