How to run Java on Dos prompt

HI~~
I am new to Java and really need help.
I have a program which requires a file as an argument and the file name should be provided as a command line argument.
In dos prompt, how do I tell computer which file is the input file for the program to take as an argument?
Thank you very much for helping me out.

suppose your file in java is Hello.java
Compile it(javac Hello.java) . u get Hello.class
Now suppose your input file is file.txt
So at the command prompt
type
c:\>java Hello file.txt
This will cause the args[0] to be initialised to file.txt
How to use it , u have to figure out.
Regards
Manoj.

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