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a typo in OCP Java SE 8 Programmer II Study Guide

 
Greenhorn
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p54, in the second last paragraph, I think that in "The Walk interface neither extends any functional interface classes nor ..." the word "classes" should be removed.
 
author & internet detective
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Claude,
Welcome to CodeRanch! Which book is this? There are a few study guides with very similar names. (Who was the author or publisher?)
 
claude lepere
Greenhorn
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Jeanne,

Very fast answer! Sorry for not being specific: I am studying with this - very good - book:
OCP Oracle Certified Professional Java SE 8 Programmer II STUDY GUIDE
EXAM 1Z0-809
Jeanne Boyarsky and Scott Selikoff
SYBEX A Wiley Brand
Copyright 2016
ISBN: 978-1-119-06790-0

and the supposed typo is in Chapter 2 - Design Patterns and Principles,
Defining a Functional Interface,
p. 54,
second line of the second to last paragraph
 
Jeanne Boyarsky
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Claude,
Ah, I see it now. I agree that it should have said "functional interfaces" to be more succinct. Technically an interface is a type of class/in a class file. But that's not that point.

I've added it to our private list of things that could be clearer for the next edition.
 
Don't get me started about those stupid light bulbs.
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