What is needed to get javac compiler?

I down loaded and installed jdk-6u6-windows-i586-p.exe. This runs files fine if the compiled .class files are there. When I create a nes .java file and try to compile it using javac, I get errors not recognizing javac command. What do I need to be able to get javac? JRE?
Thanks in advance
A rookie.

Punch your error into Google. This is asked a lot and you should get a gazillion hits. At least one will solve your problem.

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