Are there any good libraries of functions to use with collections in Java, such as [closed]

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Are there any good libraries of functions to use with collections in Java. I'm thinking along the lines of implementations of partition, take, drop, takeWhile, dropWhile, map, filter,开发者_Python百科 reduce...? I can write them myself, but it feels like re-inventing the wheel.

Thanks, Alex

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Lambdaj is awesome.

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Google Collections (Guava) is great! Collections2 and Iterables are utility classes worth looking at. They both have a filter and transform (like map) method, among many other things.

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apache Commons-Collections