Interprocess communications

When communicating with programs that are running in another process, there are a number of options.

One option is to use sockets for interprocess communication. One program can act as the server program that listens on a socket connection for input from the client program. The client program connects to the server with a socket. Once the socket connection is established, either program can send or receive information.

Another option is to use stream files for communication between programs. To do this, use the System.in, System.out, and System.err classes.

A third option is to use the IBM® Toolbox for Java™, which provides data queues and IBM i message objects.

You can also call Java from other languages, as demonstrated in the examples below.