Java tutorial
public class Main { public static void main(String[] args) { String r = "This is a test."; String[] s = new String[10]; int len = r.length(); int l = 3; int last; int f = 0; for (int i = 0;; i++) { last = (f + l); if ((last) >= len) { last = len; } s[i] = r.substring(f, last); System.out.println(s[i]); if (last == len) { break; } f = (f + l); } } }