public static String randomString ( int len , Random random ) { if ( len < 1 ) { return "" ; } int start = ' ' ; int end = ' ' + 1 ; StringBuffer buffer = new StringBuffer ( ) ; int gap = end - start ; while ( len -- != 0 ) { char ch ; ch = ( char ) ( random . nextInt ( gap ) + start ) ; if ( Character . isLetterOrDigit ( ch ) ) { buffer . append ( ch ) ; } else { len ++ ; } } return buffer . toString ( ) ; }
Returns a random string of a certain length