Some options take one or more arguments. If an argument contains spaces or other whitespace characters, the value should be quoted according to the conventions of the environment being used to invoke javac. If the option begins with a single dash (-) the argument should either directly follow the option name, or should be separated with a colon (:) or whitespace, depending on the option. If the option begins with a double dash (--), the argument may be separated either by whitespace or by an equals (=) character with no additional whitespace. For example,