I am having trouble with the classpath

I use the jikes compiler, and I am having trouble setting my classpath. The current classpath I have is: C:\program files\java\j2re1.4.0_01\lib\rt.jar
When I compile my Java file it says that it could not find the directory java/lang.
I have the program Robocode and the compiler on it uses Jikes, and it works, but when I try to compile one of my files on either Jcreator or MsDos Prompt it doesn't work for me. Can anybody help me on how to set my classpath?

take a look in the directory tree and see if javac is in it. when i have a path with jre in it, there isn't any compiler just the java runtime environment. you may need to install the jdk.

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