It's not that hard to perform Java file uploads. The new Servlet and JSP API, along with HTML5 input form enhancements, make Java file uploads, both synchronously and asynchronously with Ajax, ...

A JAR file is an archive file but is more than a file compression format. Here's how to open, run, or execute JAR files.

Similarly, C’s fopen() (file open) function returns a nonnull pointer (integer address) to a FILE structure on success or a null (0) pointer (represented by constant NULL) on failure.