Here you can find the source of encode(BigInteger number, String alphabets)
| Parameter | Description |
|---|---|
| number | a positive integer |
| alphabets | is the set of alphabet for encoding. |
| Parameter | Description |
|---|---|
| IllegalArgumentException | if <code>number</code> is negative |
public static String encode(BigInteger number, String alphabets)
//package com.java2s; /****************************************************************************** * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this file, * You can obtain one at http://mozilla.org/MPL/2.0/. * // w ww . ja va2s. co m * Software distributed under the License is distributed on an "AS IS" basis, * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License for * the specific language governing rights and limitations under the License. * * The Original Code is: Jsoda * The Initial Developer of the Original Code is: William Wong (williamw520@gmail.com) * Portions created by William Wong are Copyright (C) 2012 William Wong, All Rights Reserved. * ******************************************************************************/ import java.math.BigInteger; public class Main { /** * Encodes a number using BaseX encoding. * * @param number a positive integer * @param alphabets is the set of alphabet for encoding. * @return a BaseX string * @throws IllegalArgumentException if <code>number</code> is negative */ public static String encode(BigInteger number, String alphabets) { if (number.compareTo(BigInteger.ZERO) == -1) throw new IllegalArgumentException("Number cannot be negative"); StringBuilder sb = new StringBuilder(); BigInteger base = BigInteger.valueOf(alphabets.length()); BigInteger[] divrem = new BigInteger[] { number, BigInteger.ZERO }; while (divrem[0].compareTo(BigInteger.ZERO) == 1) { divrem = divrem[0].divideAndRemainder(base); sb.append(alphabets.charAt(divrem[1].intValue())); } return (sb.length() == 0) ? alphabets.substring(0, 1) : sb .reverse().toString(); } }