Cannot open any Java files on my Mac OSX: Problem Solved

Hello all,
I have just begun an Introduction to Java class and I'm already having problems...namely, I cannot open .java files on my Mac.
Whenever I try to open them, I get an error message that says: "You cannot use this version of the application Xcode with this version of Mac OS X."
I'm running version 10.5.4 on a PowerPC Mac. It's a few years old, but I don't understand how it could already be so outdated as to not allow me to even use the application.
I am 100% new to programming and don't really know at all what I'm doing. Apple says their JDK comes with every Mac and no one else seems to be having this problem. I don't really even know where to go to for updates, if that is what I need to do, or if I should just download a different JDK.
This is an intensive (6-week) class and I don't want to fall behind, but it's halfway through the first week and I cannot even open files.
Any suggestions greatly appreciated.
EDIT: I figured out the problem by getting out my installation disks and I found the latest xCode tools app in the "optional packages" folder.
Installed it and now I'm up and running.
Edited by: chalks on Sep 17, 2008 10:09 AM

You can download Adobe Reader from adobe.com. The Mac OSX uses its "reader" to open PDF files without the Adobe Reader. If you downloader adobe reader, it should open all PDF files. Hope this helps.

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