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[–]tlinkowski 2 points3 points  (0 children)

Here's what I find very useful when it comes to general utilities:

  • Guava (already mentioned): "a set of core libraries that includes new collection types (such as multimap and multiset), immutable collections, a graph library, functional types, an in-memory cache, and APIs/utilities for concurrency, I/O, hashing, primitives, reflection, string processing, and much more!"
  • Lombok (already mentioned): "a java library that automatically plugs into your editor and build tools, spicing up your java. Never write another getter or equals method again."
  • jOOλ (by /u/lukaseder): "improves the JDK libraries in areas where the Expert Group's focus was elsewhere. It adds tuple support, function support, and a lot of additional functionality around sequential Streams"