Failing at the first steps:(...

Hi!
I have just begun to learn java after "java in 21 days"!
I wrote a little programm and saved it as a .java file!
Now I should open it with "javac blabla.java" but I always get an error message telling me that the command "javac" has been written wrong or can`t be found!? Can anybody help me with that please? i am in the right directory (where I saved the file) and also seem to have installed jdk correctly (when I command "java -version", it tells me anything correct)!
Please help me..
Thx in advance

If java -version returns a response, but javac whatever.java doesn't, you may only have the run-time installed rather than the full jdk. Find the java program on your file system and check that the binary for javac is in the same directory. If not, download and install the full jdk.

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