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  1. /* package whatever; // don't place package name! */
  2.  
  3. import java.util.*;
  4. import java.util.stream.*;
  5. import java.lang.*;
  6. import java.io.*;
  7.  
  8. /* Name of the class has to be "Main" only if the class is public. */
  9. class Ideone
  10. {
  11. public static void main (String[] args) throws java.lang.Exception
  12. {
  13. List<List<Integer>> data = new ArrayList<List<Integer>>();
  14. data.add(Arrays.asList(1, 2, 3));
  15. data.add(Arrays.asList(4, 5, 6));
  16. int[][] res = data.stream().map(l -> l.stream().mapToInt(v -> v).toArray()).toArray(int[][]::new);
  17. for (int i = 0 ; i != res.length ; i++) {
  18. for (int v : res[i]) {
  19. System.out.print(v + " ");
  20. }
  21. System.out.println();
  22. }
  23.  
  24. }
  25. }
Success #stdin #stdout 0.13s 4386816KB
stdin
Standard input is empty
stdout
1 2 3 
4 5 6