Understanding Coupling versus Cohesion

[Richard Broersma]

I purchased a SCJP test question practice tool.

One question is:

"Which of the following concepts is a measure of inter-class dependencies? "

My intuition is that coupling is related the concept of inter-class dependencies. However, according to the testing tool, Cohesion is a measure of inter-class dependencies.

I figure that my understand of cohesion must be incomplete because I can't seem to accept this as the correct answer.

Can anyone explain why inter-class dependencies are associated with cohesion and not coupling?

[Ruben Soto]

Richard,

You are correct. Coupling measures inter-class dependency. Cohesion measures how focused a class is. In other words, a class should do only a few very related things, as opposed to combining functionality that should be split in different classes to promote modularity and code reuse.

[Richard Broersma]

Thanks for the clarification. I'll submit a bug report to the testing software.

[W. Joe Smith]

Richard Broersma wrote:I purchased a SCJP test question practice tool.

Which one? I ask because you may be able to search this forum (or others, the internet is huge...) to find a list of exam errata.

[Richard Broersma]

This is the certification test tool that I am using. I would love to find errata for this tool.

http://www.ucertify.com/exams/SUN/CX310-066.html