Java tutorial
//package com.java2s; /** * Copyright 2008 - 2009 * * 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. * * @project loonframework * @author chenpeng * @emailceponline@yahoo.com.cn * @version 0.1 */ public class Main { public static String toNumberPassword(int length) { if (length < 1) { return null; } String strChars[] = { "1", "2", "3", "4", "5", "6", "7", "8", "9" }; StringBuffer strPassword = new StringBuffer(); int nRand = (int) Math.round(Math.random() * 100D); for (int i = 0; i < length; i++) { nRand = (int) Math.round(Math.random() * 100D); strPassword.append(strChars[nRand % (strChars.length - 1)]); } return strPassword.toString(); } }