Here you can find the source of hex(Iterator
private static int hex(Iterator<Integer> it) throws IndexOutOfBoundsException
//package com.java2s; /*/*from w w w . java2s.com*/ * * This library is free software; you can redistribute it and/or modify it under the terms of the * GNU Lesser General Public License as published by the Free Software Foundation; either version * 2.1 of the License, or (at your option) any later version. * * This library 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 library; * if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA * 02110-1301 USA * * @author fgm * */ import java.util.Iterator; public class Main { private static int hex(Iterator<Integer> it) throws IndexOutOfBoundsException { if (it.hasNext()) { Integer nx = it.next(); if (nx == '%') { int hi = Character.digit(it.next(), 16); int lo = Character.digit(it.next(), 16); return ((hi << 4) | lo) & 0x3f; } else return nx; } else throw new IndexOutOfBoundsException(); } }