as the title, I'd like to store data from result set to hash map and then use them for further processing (max, min, avg, grouping).
So far, I achieved this by using a proper hash map and implementing each operation from scratch - iterating over the hash map (key, value) pairs.
My question is: does it exist a library that performs such operations?
For example, a method that computes the maximum value over a List or a method that, given two same-size arrays, performs a "index-to-index" difference.
Thanks in advance.
There are some usefull functions in
Collections API already.
Please investigate collections documentation to see if there is a function that you need. Probably there woulde be.