Java tutorial
//package com.java2s; //License from project: Open Source License import java.util.Random; public class Main { public static char randomChar() { return randomChar("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"); } public static char randomChar(String alphabet) { return alphabet.charAt(new Random().nextInt(alphabet.length())); } }