The best way to check the differences between two lists? Or substracting

Hi,
I am Googling on this and find many different answers and I am not sure what the best approach is. I have two lists:
List A: with 10000 entries (String with length 6 all of them)
List B: with 10002 entries (String with length 6 all of them)
List A and B are almost identical but with 2 differences. I want to find these two differences or in other words generating a third list, List C with these 2 differences.
What is the best way to approach? To us Array, ArrayList, Vectors, Hashmap, Hashtable...
Thank you for any hunches

Maria1990 wrote:
I think I found the easiest approach...
listA = [a, b, c];
listB = [a, b];
listC = listA.removeAll(listB);
...but if it is the best approach with performance in mind.. I have no idea...It really depends on what sort of comparison you want. Lists allow duplicate elements, Sets do not; so a comparison of Sets based on the contents of your Lists would only return distinct element differences.
My suggestion: sort both lists and do a "staircase" comparison. That is (assuming they're both in ascending order):
1. Read through both until you find a mismatch.
2. Read through the one containing the "lesser" element, until you find a match, or until it's exhausted.
3. If you find a match, go back to 1.
4. If you exhaust one list, then any remaining elements in the other are also "mismatches".
HIH
Winston
PS: With this approach, you can also flag your mismatches as "A not in B" or "B not in A".
Edited by: YoungWinston on Jul 27, 2010 4:24 AM

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