Some possible errata in OCP Sybex's book

[Tomas Castagnino]

Hello all!

In page 140, in table 3.7 it says that in Maps and Sets the elements are not ordered. However, TreeSet and TreeMap both sort their elements, and since I think that sorting implies ordering the table's statement may not be completely accurate.  

In Chapter 4, page 187, table 4.3, I think that the question marks in “For Intermediate Operations?” and “For Terminal Operations?” might be redundant or lead to confusion (in me, at least). Because there is already a “?” in each scenario. Just a suggestion.

Finally, in page 201, bellow “Before you say that it is harder to read, we can format it:”, I believe it has to be:

list.stream()
.filter(n-> n.length() == 4)
.sorted()
…

instead of:

stream.filter(n-> ...)


That's it.

Thanks!

[Jeanne Boyarsky]

Tomas Castagnino wrote:In page 140, in table 3.7 it says that in Maps and Sets the elements are not ordered. However, TreeSet and TreeMap both sort their elements, and since I think that sorting implies ordering the table's statement may not be completely accurate.  

The table is not an errata. It is an important distinction. The Map and Set interfaces do *not* provide ordering. If the exam asks you about an interface that orders elements, the answer is List or Queue. If the exam asks about a class, it is a different story. That's cover in table 3.8. Read carefully on the exam. You don't want to get a question wrong because you were thinking about implementations when asked about an interface!

Tomas Castagnino wrote:In Chapter 4, page 187, table 4.3, I think that the question marks in “For Intermediate Operations?” and “For Terminal Operations?” might be redundant or lead to confusion (in me, at least). Because there is already a “?” in each scenario. Just a suggestion.

Hmm. Mixed feelings on that one. I definitely see your point and added it to the list of things to consider changing if we update the book for Java 9.

Tomas Castagnino wrote:Finally, in page 201, bellow “Before you say that it is harder to read, we can format it:”, I believe it has to be:

list.stream()

That one is definitely an errata! Adding to the list.