Here you can find the source of generateRandomStr(final int length)
public static String generateRandomStr(final int length)
//package com.java2s; /*// w w w . j a v a2 s . c om * Copyright 2015 FUJITSU LIMITED * * 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. */ public class Main { public static String generateRandomStr(final int length) { final StringBuilder builder = new StringBuilder(); for (int i = 0; i < length; i++) { builder.append(i); } return builder.toString(); } }