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1-save file as HelloWorld.java  (Like the Class name)

2-open CMD [start>>run>>print CMD>>enter ]

3-Now after open Print : cd C:\Program Files\Java\jdk1.5.0\bin\ 

4-now you can compile the program with print : javac "C:\DocumentsandSettings\ahmed\MyDocuments\ahmed.java\HelloWorld\HelloWorld.java"    < where you save >
                                                     

5-print : cd C:\Documents and Settings\ahmed\My Documents\ahmed.java\HelloWorld\
              

6-now you can run the prog  print : java HelloWorld

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**** the path could be not the same in your P.C so find it and edit my doc.

I try it and it is work