Back to project page CommonClasses.
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GNU General Public License
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/* * This source is part of the CommonClasses repository. */*from w w w .j a va 2 s . co m*/ * Copyright 2014 Kevin Liu (airk908@gmail.com) * * CommonClasses is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * CommonClasses 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 General Public License for more details. * * You should have received a copy of the GNU General Public License * along with CommonClasses. If not, see <http://www.gnu.org/licenses/>. */ package com.github.commonclasses.string; import java.security.SecureRandom; import java.util.Random; /** * Random String Generator */ public class RandomString { private static int DEFAULT_STRING_LONG = 6; private static char[] CHARSET_AZ_09 = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".toCharArray(); /** * Get a random string with default length * * @return the random string */ public static String getRandomString() { return randomString(CHARSET_AZ_09, DEFAULT_STRING_LONG); } /** * Change the default length with new value * * @param newLength the new length you wanna change to * @return the default length */ public static int changeDefaultLength(int newLength) { if (newLength > 0) { DEFAULT_STRING_LONG = newLength; } return DEFAULT_STRING_LONG; } private static String randomString(char[] characterSet, int length) { Random random = new SecureRandom(); char[] result = new char[length]; for (int i = 0; i < result.length; i++) { // picks a random index out of character set > random character int randomCharIndex = random.nextInt(characterSet.length); result[i] = characterSet[randomCharIndex]; } return new String(result); } }