// typeinfo/InterfaceViolation.java

// (c)2016 MindView LLC: see Copyright.txt

// We make no guarantees that this code is fit for any purpose.

// Visit http://mindviewinc.com/Books/OnJava/ for more book information.

// Sneaking around an interface

import typeinfo.interfacea.*;

class B implements A {

public void f() {}

public void g() {}

}

public class InterfaceViolation {

public static void main(String[] args) {

A a = new B();

a.f();

// a.g(); // Compile error

System.out.println(a.getClass().getName());

if(a instanceof B) {

B b = (B)a;

b.g();

}

}

}

/* Output:

B

*/