public static String randomString(String sampler,int length){
  StringBuilder builder=new StringBuilder(length);
  for (int i=0; i < length; i++)   builder.append(sampler.charAt(SEEDED_RANDOM.nextInt(sampler.length())));
  return builder.toString();
}

public static String randomString ( String sampler , int length ) { StringBuilder builder = new StringBuilder ( length ) ; for ( int i = 0 ; i < length ; i ++ ) builder . append ( sampler . charAt ( SEEDED_RANDOM . nextInt ( sampler . length ( ) ) ) ) ; return builder . toString ( ) ; }
create a string that is a random sample ( with replacement ) from the given string
