Here you can find the source of getRandomString(final int size)
public final static String getRandomString(final int size)
//package com.java2s; /*/*from www. ja va 2 s. c o m*/ * Copyright (C) 2014 J. Paul Jackson <jwareservices@gmail.com> * * This program 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. * * This program 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 this program. If not, see <http://www.gnu.org/licenses/>. */ import java.util.Random; public class Main { /************************************************************************** Random Stuff **************************************************************************/ final static Random r = new Random(); public final static String getRandomString(final int size) { final StringBuilder randomString = new StringBuilder(size); for (int i = 0; i < size; i++) { randomString.append(getRandomCharacter()); } return randomString.toString(); } public final static char getRandomCharacter() { final char[] chars = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z' }; return chars[getNextRandom(26)]; } public final static int getNextRandom(final int limit) { return r.nextInt(limit); } }