Here you can find the source of stringForBig(BigInteger big, int sigchars)
private static String stringForBig(BigInteger big, int sigchars)
//package com.java2s; /**/*from w w w . j a v a 2 s . co m*/ * Copyright 2009 T Jake Luciani * * Licensed to the Apache Software Foundation (ASF) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. The ASF licenses this file * to you 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. */ import java.math.BigInteger; public class Main { public static final String hashChars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; public static final BigInteger CHAR_MASK = new BigInteger("65535"); private static String stringForBig(BigInteger big, int sigchars) { char[] chars = new char[sigchars]; for (int i = 0; i < sigchars; i++) { int maskpos = 16 * (sigchars - (i + 1)); // apply bitmask and get char value chars[i] = hashChars.charAt( big.and(CHAR_MASK.shiftLeft(maskpos)).shiftRight(maskpos).intValue() % hashChars.length()); } return new String(chars); } }