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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.Arrays;
  4. import java.util.List;
  5. import java.util.stream.IntStream;
  6. import java.util.stream.Collectors;
  7.  
  8. class Ideone {
  9. 	public static void main (String[] args) {
  10. 		try {
  11. 			partition(List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11), 2);
  12. 			System.out.println("Should have thrown, but did not");
  13. 		} catch (IllegalArgumentException e) {
  14. 			System.out.println("Threw exception as expepcted");
  15. 		}
  16. 		System.out.println(partition(
  17. 			List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12),
  18. 			2));
  19. 		System.out.println(partition(
  20. 			List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12),
  21. 			3));
  22. 		System.out.println(partition(
  23. 			List.of(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12),
  24. 			4));
  25. 	}
  26.  
  27. 	public static List<List<Integer>> partition(
  28. 			List<Integer> list, 
  29. 			int partitionSize) {
  30.         int listSize = list.size();
  31.         if (listSize % partitionSize != 0) {
  32. 			throw new IllegalArgumentException("The size of the list must be "
  33. 					+ "divisible without remainder by the partition size.");
  34. 		}
  35.         final int parts = listSize / partitionSize;
  36. 		return IntStream.range(0, parts)
  37.             .mapToObj(i -> list.subList(2 * i, 2 * i + partitionSize))
  38.             .collect(Collectors.toList());
  39. 	}
  40. }
Success #stdin #stdout 0.09s 34288KB
comments (?)
stdin 
Standard input is empty
stdout 
Threw exception as expepcted
[[1, 2], [3, 4], [5, 6], [7, 8], [9, 10], [11, 12]]
[[1, 2, 3], [3, 4, 5], [5, 6, 7], [7, 8, 9]]
[[1, 2, 3, 4], [3, 4, 5, 6], [5, 6, 7, 8]]
https://ideone.com/dGQ5Rs
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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