Java tutorial
//package com.java2s; import java.security.SecureRandom; public class Main { private final static char[] vowels = "aeiou".toCharArray(); private final static char[] consonants = "bcdfghjklmnpqrstvwxyz".toCharArray(); private static String randomWord(int lenght, SecureRandom random) { StringBuilder builder = new StringBuilder(lenght); for (int i = 0; i < lenght; ++i) { if (i % 2 == 0) { builder.append(consonants[random.nextInt(consonants.length)]); } else { builder.append(vowels[random.nextInt(vowels.length)]); } } return builder.toString(); } }