Here you can find the source of formatNationalNumber(String nationalNumber)
public static String formatNationalNumber(String nationalNumber)
//package com.java2s; /*//from w w w . j a v a 2 s . c o m * eID Middleware Project. * Copyright (C) 2010-2013 FedICT. * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU Lesser General Public License version * 3.0 as published by the Free Software Foundation. * * This software is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this software; if not, see * http://www.gnu.org/licenses/. */ public class Main { public static String formatNationalNumber(String nationalNumber) { // YY MM DD S&G CS // 01 23 45 678 9A StringBuilder formatted = new StringBuilder( nationalNumber.substring(0, 2)); formatted.append('.'); formatted.append(nationalNumber.substring(2, 4)); formatted.append('.'); formatted.append(nationalNumber.substring(4, 6)); formatted.append('-'); formatted.append(nationalNumber.substring(6, 9)); formatted.append('.'); formatted.append(nationalNumber.substring(9)); return formatted.toString(); } }