Java: how can I split an ArrayList in multiple small ArrayLists?

Question

How can I split an ArrayList (size=1000) in multiple ArrayLists of the same size (=10) ?

ArrayList<Integer> results;

Answer 1

Apache Commons Collections 4 has a partition method in the ListUtils class. Here’s how it works:

import org.apache.commons.collections4.ListUtils;

...

int targetSize = 100;

List<Integer> largeList = ...

List<List<Integer>> output = ListUtils.partition(largeList, targetSize);