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

Question

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, reduce...? I can write them myself, but it feels like re-inventing the wheel.

Thanks, Alex

Answer 1

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.

Answer 2

Lambdaj is awesome.

Answer 3

apache Commons-Collections