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Greetings...
This seems like a really slow time on the Java calendar... maybe it's just
a little Macworld envy. I mean, when was the last time the mainstream
press gushed about a Java-based product? Has it ever happened? I guess
it's the enterprise focus that Java seems to have developed, but most of
the Java developments that I see picked up by the computer press involve
middleware, tools, IDEs, or Java itself. And maybe that makes sense if
Java's users, per se, are the developers, sysadmins, CTOs, and others
who'll use Java to deliver products and solutions, but just once I'd like
to see some kind of software targeted at end-users with the sell "and it's
cool because it runs on all your computers and computer-like devices!"
One field infrequently addressed by Java applications is media. But there
are helper libraries to help you do it. One of them is QuickTime for
Java, which provides an object-oriented wrapper around the native
QuickTime library on Mac and Windows. The article "Streaming QuickTime
with Java" shows you how to use Java to set up a streaming media server,
supporting any of the various QuickTime codecs, including MPEG-4, Sorenson
Video 3, H. 263, and more. If you're interested in Java Media, watch for
O'Reilly's upcoming book, "QuickTime for Java: A Developer's Notebook."
http://www.onjava.com/pub/a/onjava/2005/01/12/strmng_qtj.html
Another field with multiple options available to the developer is XPath.
Parsing XML with XPath is possible with both JDOM (http://www.jdom.org)
and J2SE 5.0's java.xml.xpath package. In "Parsing an XML Document with
XPath," Deepak Vohra takes a look at parsing an XML document with each of
these API's, so you can decide which one is right for you.
http://www.onjava.com/pub/a/onjava/2005/01/12/xpath.html
Tell me if this has ever happened to you. You're developing part of a
large enterprise system, and a key piece you interface with isn't done by
the time you need to unit test. Or not even started. Or it's done, but
it requires so many resources (servers, databases, licenses for some
third-party piece you've tied into) that setting up and running a second
copy for your testing is prohibitively expensive. Often, the way out of
this trap is to use mock objects to simulate the other piece, and rather
than write it yourself, you might want to have the mock object created for
you. EasyMock can do it, but its use of java.lang.reflect.Proxy means you
can only generate mock objects from interfaces. In "Mock Objects in Unit
Tests," Lu Jian introduces his Mocquer library, which generates mock
objects not only from interfaces but from classes as well.
http://www.onjava.com/pub/a/onjava/2005/01/12/mocquer.html
Please join us again next week.
Chris Adamson, editor ONJava.com
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