Spartan Java

I recently had to load a bunch of objects into memory and then perform thousands of look-ups over that collection. Using the good old java.util.ArrayList just didn’t cut it, the contains() function is extremely slow (as you would guess of course since this implementation stores elements as they are inserted and without any aditional indexing structure).
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The best tool I’ve found so far to serialize POJOs to JSON (and back again) is XStream, it’s automatic, simple and elegant, check it out.