Re: Comparing Collections

I originally wanted to be able to implement the Comparable interface. Since
none of the Collections class implement Comparable I came up with this
solution. It ended up where equals() worked for me, but in order to satisfy
the Comparable.compare(T o) contract I still had to compare a list of SQL
statements.

I see what you mean about Test Driven Design. That actually makes a lot of
sense. I'm definitely going to read more about this.

--
James R. Perkins
http://twitter.com/the_jamezp


On Thu, Sep 3, 2009 at 09:56, Thorbjoern Ravn Andersen <ravn@xxxxxxxxxx>wrote:

James Perkins skrev:

Thorbjorn,
I do return the value in the second version I posted. It was an error in

the

code. In my original code I had:

if (c1.size() > c2.size()) {
return 1;
}

if (c1.size() < c2.size() {
return -1;
}

But why?

Are you planning to sort lists of lists?

I have actually no heard of Test Driven Design before. I will have to

read

about it a bit more, but my normal testing procedure seems to follow the
basics I read about it. My first goal is to make sure it runs, then see

if I

can break it :-)

Test Driven Design basically tells you to work like this when
implementing a new facility:

* Write a snippet calling the not-yet-existing-code and compare it to
the result you expect. Put the snippet in a test framework like junit.
* Run the test suite.
* See the new snippet fails as you do not have the code yet.
* Write the simplest possible code that makes all the tests pass.

Repeat doing this until all the cases you need have been implemented.

This tends to give a cleaner design since you think about USING your
code first. The testcases ensure that the code conforms to all your
requiresments, and you can revamp a implementation thouroughly since you
know that the testcases (which cover the important stuff) still pass.

I have seen a good introduction, which I cannot locate right now. I'll
have a look if you would like.

--
Thorbjørn Ravn Andersen "...plus... Tubular Bells!"

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