question: public String randomString ( int len ) { StringBuilder buff = new StringBuilder ( ) ; for ( int i = 0 ; i < len ; i ++ ) { String from = ( i % 2 == 0 ) ? "bdfghklmnpqrst" : "aeiou" ; buff . append ( from . charAt ( getInt ( from . length ( ) ) ) ) ; } return buff . toString ( ) ; }
target:  Get a random string with the given length.