Professional Mobile Computing with Java [Paperback]

This book's principal strength is probably its complete coverage of mobile Java's possibilities. From tiny smart cards, to Java-aware phones, to pagers and even full-fledged PDAs, the authors cover the dizzying array of acronyms involved in the Java 2 Micro Edition (J2ME). The actual source code here concentrates on two flavours (called profiles) of J2ME: the MIDP (for PDAs) and the CLDC (for pagers). To this end, this text covers both high-level controls available on the MIDP platform, and then lower-level graphical calls. They provide a case study for a contact manager then port it to the more restricted form factor of the CLDC standard.

Coverage of smart card programming will help get you started there. With just a few bytes of memory, programming smart cards requires a very different mindset, and this text shows you how to work with these devices. Coverage of additional abilities in mobile Java from the Java Message Service (JMS) and telephony APIs rounds out the text. The authors anchor their sometimes wide-ranging discussion with some larger case studies including a Towers of Hanoi simulation and a mobile application that uses global positioning information.

Later samples integrate mobile applications into the larger J2EE platform on the server-side. The code here mixes in technologies such as servlets, EJBs, XML and XSLT with mobile user interfaces. A discussion of the software design process geared toward mobile development closes out this book. Useful reference sections compare the MIDP and CLDC APIs, as well as listing all available classes and methods in each.

Though this text at times adopts a somewhat scattershot approach in its organisation, its overall coverage of the rich possibilities of today's different mobile Java standards will help make it a useful resource for understanding what Java has to offer when it comes to mobile computing. --Richard Dragan

The potential of a flexible and secure run-time environment on these new devices is immense. Mobile code, context or location-sensitive web-based services, and inter-device communication are all possible between differing devices.

The recognition that 'one size doesn't fit all', however, and the resulting introduction of configurations and profiles, is confusing. Java is still 'write once, test everywhere,' in developers' minds. This book answers in one volume the need for a detailed examination of the differences and similarities between implementations of J2ME.

Currently, deployable context based services are only possible through WAP. The book covers this exciting new area of providing location-based services.