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Sybex OCP Java 8 Study Guide: Generics section

 
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Hi,

first post : )

In Sybex OCP Java 8 Study Guide Chapter 3 Generics, section Working with Generics it presents the bounded parameter type and wildcard generic type but it only explains wildcards; it fails to mention that bounded parameter types can extend multiple classes and interfaces (1 class - n interfaces) and the fact that their bounds don't make the collections read-only (https://docs.oracle.com/javase/tutorial/java/generics/bounded.html).

Feel like that could be improved in a future version.
 
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Mike,
Welcome to CodeRanch!

That isn't included in the book because it isn't on the exam. A study guide isn't going to cover everything there is to say on a topic. And generics is plenty big and complicated already!
 
Mike Constantin
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D'ouh! Thanks for letting me know.
 
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As Jeanne pointed out, we focused the study guide on preparing you for the exam. If we tried to include every possible topic, it would easily be a 2,000+ page book! (streams can get complicated!) That said, we tried to add a side bar when we found something interesting that we thought added value, even if it wasn't strictly on the exam.
 
Mike Constantin
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I think it is the wording that got me confused:

"A bounded parameter type is a generic type that specifies a bound for the generic. Be warned that this is the hardest section in the chapter, so don’t feel bad if you have to read it more than once."

It says "hardest section in the chapter" but then there is no section at all.
 
Jeanne Boyarsky
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Mike Constantin wrote:It says "hardest section in the chapter" but then there is no section at all.


For what it's worth, that hardest section comment refers to the entire bounds section from page 117-122.
 
Scott Selikoff
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Generics and streams are topics that can be difficult because so much is built on top of each other. For example, you have to understand basic generics well before you can understand wildcards. Likewise, you need to be pretty skilled with lambdas and basic streams before jumping into more complex methods like groupingBy() and primitive streams.

For sections like this, we tried to ease you into the more complex topics one step at a time, gradually building on the preceding text. As we comment in the book though, some topics are so complex we recommend reading the chapter twice, as you are likely to get more out of it the second time!
 
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