Question on OCP Study Guide

[Ying Zhao]

Hi,
In the Comparator example given at the front of page 152, it says return r1.id = r2.id. Shouldn't it be return r1.id - r2.id, since we are using it as a comparator?

Thanks,
Ying

[Scott Selikoff]

Hi Ying,

Yes, this is an error, most likely caused when the book was type set. Thank you so much for finding and reporting it! We will update our errata page to include it: http://www.selikoff.net/ocp

Thanks again!

[Jeanne Boyarsky]

Ying,
Welcome to CodeRanch! Thanks for letting us know. You are now credited with finding this in the errata.

[Ying Zhao]

Thanks, authors. Would you please also change my name on http://www.selikoff.net/java-ocp-8-programmer-ii-study-guide/ page to Ying Zhao? It writes Ying Zhou there by mistake. Thanks in advance.

Regards,
Ying

[Ying Zhao]

Oh, does this count as another error I reported? Just kidding.

[Jeanne Boyarsky]

Sorry, fixed.

[Ying Zhao]

Dear Authors,

In Table 3.11 on page 159, I think Functional Interface used for computeIfAbsent and computeIfPresent are mixed. Please have a look.

Ying

[Jeanne Boyarsky]

Confirmed and logged. Thanks.

If/when you find more, can you start a new thread (and stick the publisher - Sybex - and page number in the subject). Now that the book promo is over, that will make it easier for people to find/reply.