OnJava8-Examples/reflection/InterfaceViolation.java at master · CSapprenticeWT/OnJava8-Examples · GitHub

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// reflection/InterfaceViolation.java

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

// Visit http://OnJava8.com for more book information.

// Sneaking around an interface

import reflection.interfacea.*;

class B implements A {

@Override 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: