[Java] Splitting String using Guava API

The method below accepts the following parameters:
   1. splitLen - number of characters the string will be splitted.
   2. arrayLen - new size of a return array.
   3. str - string to be splitted.


public static String[] splitString(int splitLen, int arrayLen, String str)
{
String[] returnTokens = null;
String[] tokens = null;

Preconditions.checkArgument(splitLen > 0);
tokens =
   Iterables.toArray(
       Splitter
           .fixedLength(splitLen)
           .split(str),
       String.class
   );

returnTokens = Arrays.copyOf(tokens, arrayLen);

return returnTokens;
}//end method


This is how to call the method.

String str = "Please split the string into 5 characters each but return only the first 3.";
String[] splittedStr = splitString(5,3,str);