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  1. import java.util.*;
  2. import java.util.stream.*;
  3. import static java.util.stream.IntStream.*;
  4. import static java.util.stream.Collectors.*;
  5.  
  6. class Example {
  7.     public static void main(String[] args) {
  8.         final List<String> strings = range(0, 11)
  9.                 .mapToObj(i -> ((Character) (char) ('A' + i)).toString())
  10.                 .collect(toList());
  11.         Collections.reverse(strings);
  12.         System.out.println(strings);
  13.  
  14.         final List<List<String>> groups = range(0, strings.size())
  15.                 .boxed()
  16.                 .collect(groupingBy(index -> index / 4))
  17.                 .values()
  18.                 .stream()
  19.                 .map(indices -> indices
  20.                         .stream()
  21.                         .map(strings::get)
  22.                         .collect(toList()))
  23.                 .collect(toList());
  24.         System.out.println(groups);
  25.     }
  26. }
Success #stdin #stdout 0.21s 33980KB
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stdin
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Standard input is empty
stdout
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[K, J, I, H, G, F, E, D, C, B, A]
[[K, J, I, H], [G, F, E, D], [C, B, A]]
https://ideone.com/KYBc7h
language:
Java (HotSpot 12)
created:
5 years ago
visibility:
public

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