Java Tip 119: Don’t know much about file history?
Enhance your file processing application by adding a file history mechanism Every programmer is familiar with a text editor either as part of an IDE or as a standalone tool. Often you must reedit source code you have recently closed.…
n class instances
Limit class instances with a modified singleton November 2, 2001 Q: How can I write a class such that I can create only five instances of that class? A: In both “Singletons Rule” and “Effective Object-Oriented Design,” I covered the…
Java Product News (updated November 2, 2001)
Matisse combines native object support with server-based SQL; Houston Technology Group upgrades EJBX; Instantis releases Web services environment; and more Compuware introduces OptimalJ November 2 — Compuware is now shipping the commercial version of OptimalJ, an advanced J2EE (Java 2…
Study guide: Class and object initialization
Brush up on Java terms, learn tips and cautions, review homework assignments, and read Jeff’s answers to student questions Glossary of terms class block initializer An initializer that makes complex class initialization possible. A class block initializer consists of the…
Reflection vs. code generation
Avoid runtime reflection when marshaling data Data marshaling (pulling data from an outside source and loading it into a Java object) can utilize the benefits of reflection to create a reusable solution. The problem is simple enough: load data from…
Interfaces: Serenity now!
Readers pepper Java Q&A with interface questions October 26, 2001 Q: A reader asks: How is it possible to call methods that belong to an interface when it is not possible to define one in an interface? As an example,…
Java Product News (updated October 26, 2001)
Sun ONE enlists Aligo; VMGear releases Optimizeit Suite; Beyond.com switches eStores to a Java-based platform; and more Sun ONE enlists Aligo October 26 — Aligo has integrated its M-1 Mobile Application Server with the Sun ONE architecture. The server integrates…
JavaMail quick start
Send and receive email with the JavaMail APIs In JavaMail you’ll find APIs and provider implementations allowing you to develop fully functional email client applications. “Email client applications” invokes thoughts of Microsoft Outlook; and, yes, you could write your own…
Think small: Java on Compaq’s iPAQ
Develop micro-Java solutions with Jeode and the SavaJe XE OS During JavaOne 2001, I looked at several alternatives for working with Java technologies on Compaq’s iPAQ. (See “Putting Java on the Information Appliance” (JavaWorld, June 2001).) Since then, I’ve looked…
Two if by sea
Answers for LinkedList and outer/inner class questions October 19, 2001 In this installment of Java Q&A, we’ll visit two quick but important questions. The first covers linked lists in Java, while the second looks at how to get an instance…
