Here you can find the source of getRandomStr()
public static String getRandomStr()
//package com.java2s; //License from project: Apache License public class Main { private static final String RANDOM_STR = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; private static final java.util.Random RANDOM = new java.util.Random(); public static String getRandomStr() { StringBuilder sb = new StringBuilder(); for (int i = 0; i < 16; i++) { sb.append(RANDOM_STR.charAt(RANDOM.nextInt(RANDOM_STR.length()))); }//from w ww . ja v a 2s.com return sb.toString(); } }