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Understanding Client-Side Technologies
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A MIDlet is a name given to an application that uses the Mobile Information Device Profile or MIDP.The SCJA exam will focus on this profile and on mobile devices.
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Configurations and Profiles
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J2ME makes use of configurations and profiles to classify a nearly infinite number of devices into a few groups that share common features. These groups then give developers well-defined targets to create their applications against. A configuration is the most basic and general description of the minimum required Java class libraries and includes features that the Java Virtual Machine must support. A device is allowed to supersede the minimum requirements of the configuration, but must be able to successfully execute any application designed for the configuration it supports. Currently there are two J2ME configurations: Connected Limited Device Configuration and Connected Device Configuration. The Connected Limited Device Configuration (CLDC) is a configuration used for resource-limited devices. It dictates a minimum level of features that the Java Virtual Machine must provide and contains the most basic Java class libraries. CLDC contains profiles that further define the target device. The profiles define Java class libraries in addition to the Java class libraries defined in the CLDC. The Mobile Information Device Profile or MIDP is a CLDC profile. It is the profile nearly all mobile phones implement. This is the most common J2ME profile and the applications are often referred to as MIDlets. It provides the Java class libraries to create user interfaces for devices with small screens. It also provides many other phone-specific Java class libraries that are very useful when working on mobile phones. Another common CLDC profile is the Information Module Profile (IMP). IMP is designed for headless systems. Embedded control units and vending machines are two examples of where this profile may be found. In general, it is a small subset of MIDP, with its most notable exclusion being the Java class libraries for creating graphical user interfaces. The second J2ME configuration is the Connected Device Configuration (CDC). This configuration has a more complete set of Java class libraries than the CLDC. It contains nearly the entire set of Java class libraries from the standard edition of Java, with the exception of the user interface libraries. This configuration is intended for use with hardware that contains more resources than the standard embedded device, but it is not a full computer. Like the CLDC, the CDC has profiles that further define the target device. The Foundation Profile defines a full implementation of the Java Virtual Machine and most of the Java class libraries, excluding the user interface classes. The Personal Basis Profile adds the AWT class libraries, in addition to what the Foundation Profile defines. Finally, the Personal Profile includes everything contained in the previously mentioned profiles, with the addition of support for applets.
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Configurations and profiles are beneficial from a development perspective because they allow you to group similar, but still different, devices together and share common code between them. A developer is not required to learn the details of every device they work with, just its configuration and profile. Since the configuration and profile are used across many devices, the time spent learning this can then be applied to many devices.
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J2ME Disadvantages
J2ME attempts to create a much more unified development environment for developers to work with. No longer does a developer have to learn different languages and libraries to work with different devices. However, J2ME does not completely follow the Java motto of write once, run anywhere. Mobile and embedded devices vary too much for this to be true. Configurations and profiles address this problem to a degree, but the experienced J2ME developer will still find many nuances that exist between devices, especially in areas dealing with user interfaces. J2ME is not intended for very complex applications. This has more to do with the intended targeted devices than with this edition of Java. Since the targeted devices are resource limited, the user interface libraries only contain basic interface elements. While this keeps the application smaller and more efficient, it also limits how complex an interface a developer can create. J2ME is ideal for creating applications to look up or record simple information. Creating complex software such as a word processor would quickly push up against the limitations of the device and J2ME libraries.
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