Polymorphism in its purest form
The nature of abstract classes and polymorphism Q: I would like to clarify my understanding of abstract classes. As I understand it, a class declared abstract is an incomplete class, not meant to be instantiated. Java would complain if an…
Sun lets Jini Starter Kit 1.1 out of the bottle
<em>JavaWorld</em> author Frank Sommers talks with Jini architect Jim This year is shaping up as a success for Jini technology. Jini licensees now exceed 50,000, and the technology is deploying everywhere from automobiles to enterprise software systems. The upcoming Fifth…
Validation with Java and XML Schema, Part 4
Build Java representations of schema constraints and apply them to Java data Validation. It still makes my stomach queasy to say the word; I often have nightmares of sitting at my desk, drooling on my keyboard as I type in…
Java Product News (December 8, 2000)
INDEXHEAD: Sun launches Java TV technology for digital television Sun Microsystems is now shipping its Java TV technology, which introduces the Java platform to the digital television market. Java TV technology was created via the Java Community Process with support…
XML for Java gains new support with Sun API enhancements
Sun introduces its JAXM and JAXP APIs December 4, 2000 — Sun Microsystems published details on Monday of two new interfaces to link its Java programming language to XML. The two new Java APIs — Java API for XML Messaging…
Reduce EJB network traffic with astral clones
Use the bean implementation outside the container to avoid remote calls The Java 2 Platform, Enterprise Edition specifies the Java community’s standard for enterprise distributed computing. Included in this standard are Enterprise JavaBeans (EJB), which provide a set of programming…
Develop n-tier applications using J2EE
An introduction to the Java 2 Platform, Enterprise Edition specification by way of BEA’s WebLogic Server Java originally made its debut in browsers and client machines; at the time, many questioned whether it was suitable for server-side development. Now, with…
Strut your stuff with JSP tags
Use and extend the open source Struts JSP tag library One great benefit of JSP and J2EE is that they enable the developer community to speak a common language. The downside of those technologies is that they sometimes require a…
Applets: Still essential to Java
How do applets fit into the big picture now? When Java made its debut in January 1996, it was targeted at the client side. Back then, some believed that Web browsers would replace operating systems entirely and provide a new…
Printing in Java, Part 2
Print your first page and render complex documents This month, we will put into practice what we learned in Part 1 of this five-part series on printing in Java. In Part 1, I presented the two printing models: the Printable…
