Question

How to split an ArrayList into evenly sized chunks in Java

Answer 1

import java.util.ArrayList;
import java.util.List;
 
public class Main {
    public static List<List<Integer>> split(List<Integer> lst, int chunk) {
        List<List<Integer>> result = new ArrayList<>();
         
        for (int i = 0; i < lst.size(); i += chunk) {
            result.add(lst.subList(i, Math.min(i + chunk, lst.size())));
        }
         
        return result;
    }
 
    public static void main(String[] args) {
        List<Integer> aList = new ArrayList<>();
         
        for (int i = 0; i < 32; i++) {
            aList.add(i);
        }
 
        System.out.println(split(aList, 5));
    }
}
 
 
 
/*
run:
 
[[0, 1, 2, 3, 4], [5, 6, 7, 8, 9], [10, 11, 12, 13, 14], [15, 16, 17, 18, 19], [20, 21, 22, 23, 24], [25, 26, 27, 28, 29], [30, 31]]
  
*/

 

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