Switching to Java 5.0 on Mac OSX (Tiger)

Hi,
I'm teaching myself Java (read newbie) from the O'Reilly books, and I'm having trouble getting OSX to use Java 5.0.
I downloaded and installed it from the Sun Development site. I know it was successful, because when I tried to do it again, the software installer detected that Java 5.0 was already there.
The problem is that I can't seem to convince OSX to use 5.0 when I try to run my examples. Even when I paste the O'Reilly examples straight into the text editor from the CD and then compile them, when I try to run, I get an error that, according to O'Reilly, means OSX isn't using Java 5.0.
Any thoughts?
Best wishes,
Laurel

Maybe O'Reilly's book is wrong. What's the error message?
I installed Java 5 on a Tiger box, and it worked fine. I dimly recall, however, an option to install it without making it the default. Maybe you did that. If so, you can use it by changing your path.

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