How to get a string array from a string with java

I am making a program where I receive a List of Integer from another method. I am looping through the list and saving the results to a String. What I want is then to convert that String to a String array. I'm doing it this way but it doesn't work. I do not know what I'm doing wrong!

 for (Iterator<Integer> j=ocupada.iterator();j.hasNext();){
                    solucion += j.next().intValue()+".";
                    
                }
                
                String array[]=solucion.split(".");