java - Three specific letters random generated from array -


i want make class can generate 3 random letters array 12 times. i'm having trouble random requesting int instead of char. help! :)

first, need define alphabet string alphabet = "aabb...", contains valid characters. code can this:

public char generaterandomletterfromalphabet(string alphabet) {     random random = new random();     return alphabet.charat(random.nextint(alphabet.length())); }

here, nextint(alphabet.length()) returns random index between 0 , length of alphabet string, random character of alphabet returned generaterandomletterfromalphabet. note random generates pseudo-random numbers.

of course, alphabet can defined array, too. here have function generate specified number of random characters alphabet character array:

public char[] generaterandomlettersfromalphabet(char[] alphabet,         int numberofletters) {      if (numberofletters < 1) {         throw new illegalargumentexception(                 "number of letters must strictly positive.");     }      random random = new random();     char[] randomletters = new char[numberofletters];      (int = 0; < numberofletters; i++) {         randomletters[i] = alphabet[random.nextint(alphabet.length)];     }      return randomletters;  }

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