How do I know the size of a file

Hi,
Would anybody please show me how to get the size of a file. for example, I create a file like this
FileInputStream FINPUT = new FileInputStream ("c:\\testing.prn");
I need to know the size of FINPUT before using it but I don't know how.
note: It is not neccessary to use FileInputStream. I can use any stream or file that allow me to check the size and read out the data from the file byte by byte.
Thanks a lot.
Hung

Thank you for your responding. But, how can I read out the data? I need to read the data from the file byte by byte.
Thanks
Hung.

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