99 lines
7.0 KiB
HTML
99 lines
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HTML
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<meta name="abstract" content="Before you begin developing ToolboxME for iSeries Java applications, you need to understand the following concepts and standards that govern such development." />
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<title>Concepts important for using ToolboxME for iSeries</title>
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<body id="microconcept"><a name="microconcept"><!-- --></a>
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<!-- Java sync-link --><script language="Javascript" src="../rzahg/synch.js" type="text/javascript"></script>
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<h1 class="topictitle1">Concepts important for using ToolboxME for iSeries</h1>
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<div><p>Before you begin developing ToolboxME for iSeries™ Java™ applications, you need to understand
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the following concepts and standards that govern such development.</p>
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<div class="section"><h4 class="sectiontitle">Java 2 Platform, Micro Edition (J2ME)</h4><p>The
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J2ME is the implementation of the Java 2 standard that provides Java runtime
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environments for Tier0 wireless devices, like personal digital assistants
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(PDAs) and cell phones. IBM<sup>®</sup> Toolbox for Java 2 Micro Edition adheres to this standard.</p>
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</div>
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<div class="section" id="microconcept__tier0"><a name="microconcept__tier0"><!-- --></a><h4 class="sectiontitle">Tier0 devices</h4><p>Wireless devices, such
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as PDAs and cell phones, that use wireless technology to connect to computers
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and networks are referred to as Tier0 devices. This name is based on the
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common 3-tier application model. The 3-tier model describes a distributed
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program that is organized into three major parts, each of which resides on
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a different computer or network:</p>
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<ul><li>The third tier is the database and related programs that reside on a server,
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often a different server than the second tier. This tier provides the information
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and the access to that information that the other tiers use to perform work.</li>
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<li>The second tier is the business logic, which typically resides on a different
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computer, typically a server, shared on a network.</li>
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<li>The first tier is generally the part of the application that resides on
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a workstation, including the user interface.</li>
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</ul>
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<p>Tier0 devices are often small, portable, resource-constrained devices,
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like PDAs and cell phones. Tier0 devices substitute for or complement the
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functionality of devices on the first tier.</p>
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</div>
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<div class="section" id="microconcept__configurations"><a name="microconcept__configurations"><!-- --></a><h4 class="sectiontitle">Connected Limited Device Configuration
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(CLDC)</h4><p>A configuration defines a minimal set of APIs and the necessary
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capabilities of a Java virtual machine to provide the functions
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expected for a large set of devices. The CLDC targets the broad set of resource-constrained
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devices that include Tier0 devices.</p>
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<p>For more information, see <a href="http://java.sun.com/products/cldc/" target="_blank">CLDC</a> <img src="www.gif" alt="Link outside Information Center" />.</p>
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</div>
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<div class="section" id="microconcept__profiles"><a name="microconcept__profiles"><!-- --></a><h4 class="sectiontitle">Mobile Information Device Profile (MIDP)</h4><p>A
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profile represents a set of APIs built on an existing configuration that
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target a specific type of device or operating system. The MIDP, built on the
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CLDC, provides a standard runtime environment that enables you to dynamically
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deploy applications and services to Tier0 devices.</p>
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<p>For more information,
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see <a href="http://java.sun.com/products/midp/" target="_blank">Mobile
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Information Device Profile (MIDP)</a> <img src="www.gif" alt="Link outside Information Center" />.</p>
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</div>
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<div class="section" id="microconcept__kvm"><a name="microconcept__kvm"><!-- --></a><h4 class="sectiontitle">Java virtual machine for wireless devices</h4><p>In
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order to run Java application, your Tier0 device requires a Java virtual
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machine that is specially designed for the limited resources of a wireless
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device. Some of the possible JVMs that you can use include the following:</p>
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<ul><li><a href="http://www.embedded.oti.com/wme/" target="_blank">IBM J9
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virtual machine, part of the IBM WebSphere<sup>®</sup> Micro Environment</a><img src="www.gif" alt="Link outside Information Center" /></li>
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<li><a href="http://java.sun.com/products/cldc/" target="_blank">Sun
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K Virtual Machine (KVM), part of CLDC</a><img src="www.gif" alt="Link outside Information Center" /></li>
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<li><a href="http://java.sun.com/products/midp/" target="_blank">MIDP</a><img src="www.gif" alt="Link outside Information Center" /></li>
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</ul>
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</div>
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<div class="section" id="microconcept__relatedinfo"><a name="microconcept__relatedinfo"><!-- --></a><h4 class="sectiontitle">Related information</h4><p>You can use
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any one of a number of development tools created to help you build wireless Java applications.
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For a brief list of such tools, see <a href="reflearn.htm#reflearn__toolboxme">Related
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information for IBM Toolbox for Java</a>.</p>
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<p>To learn more about and
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to download wireless device simulators and emulators, consult the Web site
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for the device or operating system on which you want your application to
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run.</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="micromain.htm" title="The IBM Toolbox for Java 2 Micro Edition package (com.ibm.as400.micro) enables you to write Java programs that allow a variety of Tier0 wireless devices, like personal digital assistants (PDAs) and cell phones, to directly access iSeries data and resources.">IBM Toolbox for Java 2 Micro Edition</a></div>
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</div>
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</div>
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