Java Reads and Writes?

I just picked up a book on Java and built a short program.  I can read from a file and there are write functions(classes) available.  I put my program on the web to see it run.  I doesn't.  I get security protection errors attempting to read from a file.  Why?  What good is Java if I can't read from or write to a file when using the web?  Is there something I don't understand about I/O functions in Java on the web?  Any program of value has to have these abilities.

Thanks for any suggestions you may have.

Whoever responds to this question, please give detailed information.  Thanks again.

AJY
youngs101497Asked:
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evijayConnect With a Mentor Commented:
Applets have several security restrictions to make java a secure language for web. One of the restriction is it cannot read / write files or otherwise some malicious applets can destroy the data of harddisk whenever you hit a web page unknowingly of those malicious applets. You can read/write client side files only if you sign the applets and the client browser user allows it to do so.
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youngs101497Author Commented:
What do you mean by the term "client side files?"  How do I sign an applet?  I would really like to use these abilities. If I can't, what language should I explore so I can read and write to a file which exists on the web?

Thanks again.

AJY
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evijayCommented:
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evijayCommented:
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