JAVA

 Was designed to add interactivity to HTML pages• Is a scripting language (a scripting language is alightweight programming language)• JavaScript code is usually embedded directly intoHTML pages• JavaScript is an interpreted language (means thatscripts execute without preliminary compilation)

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java programming cookbook

Peripheral devices are usually external to the computer.* Printers, mice, video

cameras, scanners, data/fax modems, plotters, robots, telephones, light switches,

weather gauges, Palm Computing Platform devices, and many others exist “out

there,” beyond the confines of your desktop or server machine. We need a way to

reach out to them.

The Java Communications API not only gives us that, but cleverly unifies the programming

model for dealing with a range of external devices. It supports both

serial (RS232/434, COM, or tty) and parallel (printer, LPT) ports. We’ll cover this

in more detail later, but briefly, serial ports are used for modems and occasionally

printers, and parallel ports are used for printers and sometimes (in the PC world)

for Zip drives and other peripherals. Before USB (Universal Serial Bus) came

along, it seemed that parallel ports would dominate for such peripherals, as manufacturers

were starting to make video cameras, scanners, and the like. Now, however,

USB has become the main attachment mode for such devices. One can

imagine that future releases of Java Communications might expand the structure

to include USB support (Sun has admitted that this is a possibility) and maybe

other bus-like devices.

This chapter† aims to teach you the principles of controlling these many kinds of

devices in a machine-independent way using the Java Communications API, which

is in package javax.comm.

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xml_programming_in_java

About this tutorial

Our first tutorial, “Introduction to XML,” discussed the basics of XML and demonstrated its potential to

revolutionize the Web. This tutorial shows you how to use an XML parser and other tools to create,

process, and manipulate XML documents. Best of all, every tool discussed here is freely available at

IBM’s alphaWorks site (www.alphaworks.ibm.com) and other places on the Web.

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