The following command enables you to run any Java JAR file on the command line: java -jar jarfilename.jar To use the JAR file opener that comes when you install Java with the JDK, just issue the ...

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.