Errata for OCP: Oracle Certified Professional Java SE 8 Programmer II Study Guide - page 195

[T Vergilio]

This really is just a typo. Sorry for being picky, I just thought this could be of use to you guys when working on a second edition of the book.

Missing colon between Stringbuilder and append in the second code sample.

StringBuilder word = stream.collect(StringBuilder::new, StringBuilder::append, StringBuilder:append);

should be:

StringBuilder word = stream.collect(StringBuilder::new, StringBuilder::append, StringBuilder::append);

[Jeanne Boyarsky]

No need to apologize. We really want to hear about typos, even minor ones! I've logged this in our errata.

It will definitely help us for a second edition. But more immediately, it also helps readers of THIS book. I wrote a blog post last year about why posting all errata, no matter how minor, is important.

[T Vergilio]

Great article, that's the spirit! I too want this book to be perfect, so I will keep sending feedback as I work my way through the chapters.

The fact that the errata list is so long means one thing to me: people appreciate the importance of this book enough to bother submitting their findings. No one wastes their time contributing to books they don't like or don't see any value in.

[Frenkel Smeijers]

On the same page it says

In practice, there are many common collectors that come up over and over. Rather than making developers keep reimplementing the same ones, Java provides an interface with common collectors.

I think this refers to Collectors, but that's a class, not an interface.

[Campbell Ritchie]

Frenkel Smeijers wrote:. . . Collectors, but that's a class, not an interface.

Please check the errata page shown above; I think you have found a “new” error.

[Jeanne Boyarsky]

I'm sorry if I'm being dense, but what's the new error you are noticing here?

If it is the case of collectors vs Collectors, that's just the English word "collectors" in the sentence. If it is something else, can you elaborate?

[Frenkel Smeijers]

The book says that Java provides an interface with common collectors, but it doesn't say which interface it means. I think it means the class java.util.stream.Collectors, but that's a class, not an interface.

[Jeanne Boyarsky]

Ah! Thank you. That should definitely say class. Thank you. I've added it to the errata and fixed in the draft for the OCP 11 book!