How to launche the compiler j2sdk1.4.1_02

hello to everybody
in my prompt when i write c:\>java [enter]
all is ok
but after that when i write
c:\>javac [enter]
nothing run and give error :"file excutable or command or file batch not found"
what can i do????
please help me
thank you
walter

also my english is bad.
ok thank to everybody to help
now my compiler is running and i executed the first
program .
i only must ti set the path because everytime i must to
write the complete path , it's not confortable.
thanks!!!

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