Welcome to the JavaRanch Johnny!
The 1.4 exam removes the AWT and IO topics but adds assertions and a couple new classes in the collections framework--LinkedHashMap and LinkedHashSet. The wrapper classes and hashcodes are further emphasized in 1.4.
Everything that you need to know about assertions is available in the document
Programming with Assertions.
A lot of people passed the 1.4 exam before an updated study guide became available, so I'm sure that you can do the same
[ March 03, 2003: Message edited by: Dan Chisholm ]