Here you can find the source of getUnsignedBigIntegerAsHex(BigInteger bi)
public static String getUnsignedBigIntegerAsHex(BigInteger bi)
//package com.java2s; /*//from www .j a v a 2 s .c o m * Copyright (c) 2010 Yahoo! Inc. All rights reserved. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, * software distributed under the License is distributed on an * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, * either express or implied. See the License for the specific * language governing permissions and limitations under the * License. See accompanying LICENSE file. */ import java.math.BigInteger; public class Main { public static String getUnsignedBigIntegerAsHex(BigInteger bi) { String hexString = bi.toString(16); if (hexString.length() < 16) { String zeroes = "000000000000000"; hexString = zeroes.substring(0, 16 - hexString.length()) + hexString; } return hexString.toUpperCase(); } }