Java tutorial
//package com.java2s; import java.util.ArrayList; import java.util.List; public class Main { public static List<String> getLettersFromMotId(String motId) { List<String> res = new ArrayList<String>(); for (int i = 0; i < motId.length(); i = i + 2) { int nbLetters = Integer.valueOf(String.valueOf(motId.charAt(i))); for (int k = 0; k < nbLetters; k++) { res.add(String.valueOf(motId.charAt(i + 1))); } } return res; } }