Can't find Javac.exe

I'm new to Java (presently taking a class). I'm very confused and not getting too far. I'm running Win XP and have downloaded the latest version of Java J2SE1.4.0_01 (actually because of repeated problems, I've uninstalled and installed it a few times).
I can't find javac.exe anywhere on my c drive. I read a past forum posting describing the same problem which suggests downloading the latest version of SDK1.4. Isn't this what I have been downloading? Where can I find this download? If it isn't what I've been downloading, why do I need both and how would I have known this? I understand how to set the path once I get javac.exe but I'm becoming frustrated trying to obtain this file and move forward with my study of java. Thanks for the help.

If you need only to run a java application then you just need a JRE (Java Runtime Enviorment ). It contains everything that you wanted to run it.
But, if you want to develop some java application , then you needs something more... you need to have to compile those source files first... For this what you want is a SDK (Software development Kit)... Both is free.. You can download the 1.4sdk from http://java.sun.com/Download6
After downloading and installing it, set the path corectly to include the bin directory of the installed folder..
Hope it helped
appu

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successfully downloaded and installed
j2sdk-1_4_0-win.exe to my hard drive. However, when I
tried to compile, I always got the message "Bad
command". Based on some suggestions in the tutorial, I
checked out my folder and did not find javac. So, my
questions is: Does the application
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