code: public static String getRandomString(final int size, final int start, final int length) {
  		final StringBuilder buff = new StringBuilder(size);
  
  		for (int i = 0; i < size; i++) {
  			buff.append((char) (RAN.nextInt(length) + start));
  		}
  		return buff.toString();
  	}
docs: Creates a size byte long unicode string. All codes are &gt;= start and &lt; start+length
  
  @param size number of characters in the return string
  @param start start code
  @param length all generated codes are within this range
  @return