Here you can find the source of toHexString(int i, int digits)
public static String toHexString(int i, int digits)
//package com.java2s; /*//from www. j a v a 2 s . co m * Copyright (c) 2002 Ernest Yu. All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS * IN THE SOFTWARE. */ public class Main { /** * Converts int value to hex string. Result is padded with leading * zeros to fill out digits. */ public static String toHexString(int i, int digits) { String hexString = Integer.toHexString(i); int len = hexString.length(); StringBuffer result = new StringBuffer(); for (int j = 0; j < digits; j++) { if (len < (digits - j)) result.append("0"); else result.append(hexString.charAt(len - digits + j)); } return result.toString(); } }