Applet Security Restrictions
Because Java applets are run on a Web user's system, there are some serious restrictions to what an applet is capable of doing. If these restrictions were not in place, a malicious Java programmer could easily write an applet that deletes user files, collects private information from the system, and commits other security breaches.
As a general rule, Java applets run under a "better safe than sorry" security model. Applets cannot do any of the following:
They cannot read or write files on the user's file system.
They cannot communicate with an Internet site other than the one that served the Web page that included the applet.
They cannot run any programs on the reader's system.
They cannot load programs stored on the ...
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