newbie ?: what is required to access Oracle using jdbc

Situation:

[Quoted]
1. The normal Oracle client stuff is set up (I can run SQLPLUS and TOAD to access Oracle 8.0.4)
2. I have installed JDK 1.3 from SUN and the "HelloWorld" programme is working

Question:

am I all set to write a Java program to access the database or do I need to get stuff like JDBC drivers or find out if it has been installed. In a JAVA code sample I found, it says I need to specifify the proper driver name :

String connString = "jdbc:my_driver_at_the_sid";

How to find out what to put in place of my_driver?

Thanks

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