code: public byte getByte(String key, byte defaultValue) {
  		addToDefaults(key, Byte.toString(defaultValue));
  		String value = get(key);
  		if (value == null) {
  			return defaultValue;
  		} else {
  			return Byte.valueOf(value);
  		}
  	}
docs: Returns the Byte value for the given key. If the key does not exists it will return the default value given.
  The method fails if the value is not a Byte.