James Perkins skrev:

* Compares the first collection against the second collection. Returns
* negative integer, zero or positive integer.
* <p>
* If the size of the first collection is greater than the size of the
* second collection, a positive integer is return. If the size of the
* collection is less than the size of the second collection a negative
* number is returned.
* </p>

int c = c1.size() - c2.size();
The javadoc does not conform to the code :) You do not return a value if the size is unequal.

Have you considered using Test Driven Design to write such a library? I usually do this because it works well for me focussing on a given detail, while the tests catch if I mess something up.

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