A Question on JDBC URLs

[Arthur Buliva]

I have seen some books write

Connection connection =
                    DriverManager.getConnection("jdbc:mysql://localhost:3306/test?",
                    "", ""); //Note the ?

while others write

Connection connection =
                    DriverManager.getConnection("jdbc:mysql://localhost:3306/test",
                    "", ""); // No ? Here

I was wondering which is better and why? What does the ? do?

[Rob Spoor]

Moving to JDBC.

[David Newton]

It (likely) doesn't do anything, if there aren't any parameters.