Requirements in Java

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34 Requirements
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This section introduces the technical requirements and constraints that were followed in defining the CLDC and MIDP standards We start with the hardware and software requirements, and then discuss the specific constraints that Java 2 Micro Edition imposes on its configurations and profiles
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It should be noted that the requirements of CLDC and MIDP are different CLDC is not targeted to any specific device category, and therefore its requirements are broader than those of MIDP MIDP is focused specifically on two-way wireless communication devices such as cell phones, and the requirements of MIDP are specific to its target market
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341 Hardware Requirements of CLDC
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CLDC is intended to run on a wide variety of small devices The underlying hardware capabilities of these devices vary considerably, and therefore the CLDC Specification does not impose any specific hardware requirements other than memory requirements Even for memory limits, the CLDC Specification defines minimum limits only The actual CLDC target devices may have significantly more memory than the minimum
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The CLDC Specification assumes that the minimum total memory budget available for the Java Virtual Machine, configuration libraries, profile libraries, and the applications is at least 192 kilobytes More specifically, it is assumed that: At least 160 kilobytes of non-volatile[3] memory is available for the virtual machine and CLDC libraries [3] The term non-volatile is used to indicate that the memory is expected to retain its contents between the user turning the device "on" or "off" For the purposes of the CLDC Specification and MIDP Specification, it is assumed that non-volatile memory is usually accessed in read mode and that special setup might be required to write to it Examples of non-volatile memory include ROM, flash, and battery-packed SDRAM The CLDC Specification or MIDP Specification do not define which memory technology a device must have, nor do they define the behavior of such memory in a power-loss scenario
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At least 32 kilobytes of volatile[4] memory is available for the virtual machine runtime (for example, the object heap) [4] The term volatile is used to indicate that the memory is not expected to retain its contents between the user turning the device "on" or "off" For the purposes of the CLDC Specification and MIDP Specification, it is assumed that volatile memory can be read from and written to directly The most common type of volatile memory is DRAM
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The ratio of volatile to non-volatile memory in the total memory budget can vary considerably depending on the target device and the role of the Java platform in the device If the Java platform is used strictly for running system applications that are built in a device, then applications can be prelinked and preloaded, and a very limited amount of volatile memory is needed If the Java platform is used for running dynamically downloaded content, then devices will
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35 Scope of the CLDC and MIDP Standards
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351 Scope of CLDC
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Based on the decisions of the JSR 30 and JSR 139 expert groups, the CLDC Specification addresses the following areas: Java language and virtual machine features
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core libraries (javalang*, javaio*, javautil*)
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input/output
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networking
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security
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The CLDC Specification intentionally does not address the following functionality areas and features: application life-cycle management (installation, launching, deletion)
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user interface functionality
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event handling
high-level application model (interaction between the user and the application)
These features can be addressed by profiles implemented on top of the Connected, Limited Device Configuration In general, the CLDC expert group intentionally kept small the number of areas addressed by the CLDC Specification in order not to exceed the strict memory limitations or to exclude any particular device category
352 Scope of MIDP
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4 Connected Limited Device Configuration
This chapter introduces the Connected, Limited Device Configuration (CLDC), one of the core building blocks of the Java 2 Platform, Micro Edition (J2ME ) The goal of the Connected, Limited Device Configuration is to provide a standardized, highly portable, minimum-footprint Java application development platform for resource-constrained, connected devices The CLDC target devices are characterized generally as follows: at least 192 kilobytes of total memory budget available for the Java platform,
a 16-bit or 32-bit processor,