fork download
copy 
  1. import java.lang.reflect.Array;
  2. import java.lang.*;
  3. import java.util.*;
  4.  
  5. class Main
  6. {
  7.     public static void main (String[] args) {
  8.         final List<List<String>> test = new ArrayList<List<String>>();
  9.                 test.add(new ArrayList<String>(Arrays.asList("a", "b", "c")));
  10.                 test.add(new ArrayList<String>(Arrays.asList("d", "e", "f", "g")));
  11.                 test.add(new ArrayList<String>(Arrays.asList("h", "i")));
  12.  
  13.                 for (final String[] innerArray : multiListToArray(test, String.class)) {
  14.                         System.out.println(Arrays.toString(innerArray));
  15.                 }
  16.     }
  17.  
  18.     public static <T> T[][] multiListToArray(final List<List<T>> listOfList, final Class<T> classz) {
  19.         final T[][] array = (T[][]) Array.newInstance(classz, listOfList.size(), 0);
  20.                 for (int i = 0; i < listOfList.size(); i++) {
  21.                 array[i] = listOfList.get(i).toArray((T[]) Array.newInstance(classz, listOfList.get(i).size()));
  22.             }
  23.  
  24.         return array;
  25.     }
  26. }
Success #stdin #stdout 0.07s 380224KB
comments (?)
stdin
copy 
Standard input is empty
stdout
copy 
[a, b, c]
[d, e, f, g]
[h, i]
https://ideone.com/9dxEId
language:
Java (HotSpot 12)
created:
12 years ago
visibility:
secret

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!