When variables are shared between threads, they must always be accessed properly in order to ensure that correct and valid values are manipulated. The JVM is guaranteed to treat reads and writes of data of 32 bits or less as atomic. This might lead some programmers to believe that access to shared variables does not need to be synchronized or the variables declared volatile.
An old Java technology hand and new Enhydra partisan, the author urges developers to consider alternatives to JavaServer Pages (JSP) servlets when choosing an approach to coding Web applications. JSP technology, part of Sun’s J2EE platform and programming model, serves as a solution to the common dilemma of how to turn drab content into a visually appealing presentation layer. The fact is, Web developers aren’t uniformly happy with JSP technology. Since many variations on the Sun technology are now available, you can choose from a number of presentation technologies. This article takes an in-depth look at JSP coding and explores some attractive alternatives.
Scott Ambler explains how to use accessors, and why their use is one of the most important standards your organization can enforce. This article is modified from Chapter 8 of The Object Primer 2nd Edition.
Allen Holub suggests that the Java programming language’s threading model is possibly the weakest part of the language. It’s entirely inadequate for programs of realistic complexity and isn’t in the least bit object oriented. This article proposes significant changes and additions to the Java language that would address many of these problems.
The synchronized keyword locks objects. Because the object is locked inside of synchronized code, what does that mean to the object and to changes you make to its object reference? Synchronizing on an object locks only the object. You must be careful, however, not to reassign an object reference of a locked object. What happens if you do?
Fields, also known as attributes or member attributes, are the data aspects of objects. A field’s visibility defines the level of access to it by Java objects. This week’s discussion, modified from Chapters 7 and 8 of The Object Primer 2nd Edition, focuses on the types of field visibility, how to implement fields, and how to access them.
We’ve received numerous requests for help with modifying Master Form and other programs for integrating with authorize.net’s SIM integration method. Authorize.net is asking clients using the ADC Relay Response method to switch to the SIM method. And they have a deadline.
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