James Perkins skrev:
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.

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