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J2ME: The Complete Reference
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Thick client applications handle most processing locally
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Thin client applications rely on server-side software for nearly all processing
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J2ME Overview
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Let s say that a wireless small computing device is used to transact orders on the floor of a stock exchange The wireless device has software to handle user interactions such as displaying an electronic form on the screen, collecting user input, processing the input, and displaying results of the processing on the screen The order form is displayed on the screen, and the user enters information into the order form using various input conventions commonly found in small wireless devices The device collects the order information and then processes the order using a combination of software on the wireless device and software running on a back-end system that receives the order through a wireless connection Processing on the wireless device might involve two steps: First the software performs a simple validation process to assure that all fields on the form contain information Next the order is transmitted to the back-end system The back-end system handles adjusting account balances and other steps involved in processing the order A confirmation notice is returned by the back-end system to the wireless device, which displays the confirmation notice on the screen (Figure 1-5) A key benefit of using J2ME is that J2ME is compatible with all Java-enabled devices A Java-enabled device is any computer that runs the Java Virtual Machine Ericsson,
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J2ME BASICS
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A J2ME application is a balance between local and server-side processing
J2ME: The Complete Reference
Motorola, Nextel, Nokia, Panasonic, and RIM all have Java-enabled devices In addition, J2ME maintains the powerful security features found in the Java language and enables wireless and small computing devices to access resources that are within an organization s firewall
How J2ME Is Organized
Traditional computing devices use fairly standard hardware configurations such as a display, keyboard, mouse, and large amounts of memory and permanent storage However, the new breed of computing devices lacks hardware configuration continuity among devices Some devices don t have a display, permanent storage, keyboard, or mouse And memory availability is inconsistent among small computing devices The lack of uniform hardware configuration among the small computing devices poses a formidable challenge for the Java Community Process Program, which is charged with developing standards for the JVM and the J2ME for small computing devices J2ME must service many different kinds of small computing devices, including screenphones, digital set-top boxes used for cable television, cell phones, and personal digital assistants The challenge for the Java Community Process Program is to develop a Java standard that can be implemented on small computing devices that have nonstandard hardware configurations The Java Community Process Program has used a twofold approach to addressing the needs of small computing devices First, they defined the Java run-time environment and core classes that operate on each device This is referred to as the configuration A configuration defines the Java Virtual Machine for a particular small computing device There are two configurations, one for handheld devices and the other for plug-in devices Next, the Java Community Process Program defined a profile for categories of small computing devices A profile consists of classes that enable developers to implement features found on a related group of small computing devices
J2ME Configurations
There are two configurations for J2ME as of this writing These are Connected Limited Device Configuration (CLDC) and the Connected Device Configuration (CDC) The CLDC is designed for 16-bit or 32-bit small computing devices with limited amounts of memory CLDC devices usually have between 160KB and 512KB of available memory and are battery powered They also use an inconsistent, small-bandwidth network wireless connection and may not have a user interface CLDC devices use the KJava Virtual Machine (KVM) implementation, which is a stripped-down version of the JVM CLDC devices include pagers, personal digital assistants, cell phones, dedicated terminals, and handheld consumer devices with between 128KB and 512KB of memory CDC devices use a 32-bit architecture, have at least two megabytes of memory available, and implement a complete functional JVM CDC devices include digital set-top boxes, home appliances, navigation systems, point-of-sale terminals, and smart phones
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