Java , add new string object if the length of the chain exceeds a number of character

I'm trying to add a new String in arraylist if the lenght of this one is too big.

like that;

private void createLore(String s) {
ArrayList<String> a = new ArrayList<String>();
if(s.lenght > maximumLenght) {
a.add(s /TODO  new object with same string
//it's like a new line .. possible to detect a space ? 
//This avoids the cut of a text

Thank's !