Newbie question on error message

I am new to java so please forgive what maybe a stupid question:

I downloaded the 5.0 version of java and everything went well. I was then told that the IBM rational tool that we use in a new dept that I just moved into stated that that version is not supported. Therefore I uninstalled it and installed the 1.4.2_08 (last version on sun.com). Now when I am trying to go through a NON-IBM RATIONAL tutorial I am getting the following error that, after googling on the error message, states that I am having a conflict with the 5.0 JRE but I no longer have 5.0 installed. I now just installed both the 1.4.2_08 versions of the JRE and JDK from my system but to no avail. Here is what i have in my PATH under the SYSTEM VARIABLES section:

%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;
C:\j2sdk1.4.2_08\bin;C:\Program Filles\NetManage\RUMBA\System;
C:\Program Files\Microsoft SQL Server\80\Tools\BINN

Here is my CLASSPATH:

.;C:\Program Files\CoreJavaBook

Any help or direction would be appreciated. Thanks.

[ June 21, 2005: Message edited by: Melinda Savoy ]
[ June 21, 2005: Message edited by: Melinda Savoy ]

I am getting the following error

Can you post the actual error?

My apologies, here is the error:

C:\Program Files\CoreJavaBook\v1ch4\Calendar\ch4_1Calendar.java:16: cannot access corejava.Day
bad class file: C:\Program Files\CoreJavaBook\corejava\Day.class
class file has wrong version 49.0, should be 48.0
Please remove or make sure it appears in the correct subdirectory of the classpath.
Day today = new Day(); // today's date
^
1 error

Tool completed with exit code 1

You need to delete the class file Day.class (and probably all the other CoreJavaBook classes) and recompile them with 1.4.2_08.

Or else reinstall Java 1.5 alongside 1.4.2 and don't use the IBM tool for this exercise(presumably the tutorial includes instructions on how to run the app from the command line?).

I guess that if you are allowed to install different Java versions then you should have access to a command shell? You can then switch between versions by changing the PATH variable...

Paul,

Thanks so much for your help and time.

Regards.