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typo in OCP Java SE 8 Programmer II Study Guide

 
Greenhorn
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Jeanne,

In
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

p. 143, Comparator vs. Comparable, paragraph after the NOTE:
"There is also a class called Comparator,"
As Comparator is a functional interface, I think replacing "class" with "interface" should be clearer, but I agree with your previous answer that an interface is a type of class.
 
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Actually, I think you are right, that Comparator isn't a class.
 
Consider Paul's rocket mass heater.
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