Efficient way to divide a list into lists of n size

Question

I have an ArrayList, which I want to divide into smaller Lists of n size, and perform an operation on each. My current method of doing this is

implemented with Array

Answer 1

Since you want to optimise your performance you should use a parallel stream instead of a for loop. This way you can use multiple threads.

Lists.partition(A, n).parallelStream().forEach({
    //do stuff with temp
});

You can also use other ways to wort with the stream for example collect or map if it matches your purpose.