connecting to a database

[mxb7642]

this is probably a really stupid question, but this i my first time working with databases so here it goes. I'm trying to connect to a database using the following code:

Code:

Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
String url = "jdbc:sqlserver://localhost:1433;database=tempdb;";
String user = "sa";
String pw = "";
Connection con = DriverManager.getConnection( url, user, pw );

I keep getting this error however - Login failed for user 'sa'. Reason: Not associated with a trusted SQL Server connection..
I've checked the database and this is deffinitely a valid username. I've also tried several other databases with various usernames and i keep getting the same error.

Is there something horribly wrong with my code? Please help

[ksbrother]

Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con=DriverManager.getConnection("jdbcdbc:dsname" ,"username","password");