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INTRODUCTION
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J2ME Devices CLDC Information appliances CDC
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Figure 1.2 Devices that are specifically supported by J2ME fall between the Smart Card and the desktop or laptop computer. These devices, often referred to collectively as information appliances, include, but are not limited to cell phones, pagers, PDAs, set-top boxes, and Internet phones. CLDC and CDC are specifications that define J2ME at opposite ends of the device spectrum. More information on these specifications is provided in chapter 2.
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to the array of electronic devices and information appliances that range from just below the personal computer down to, but not including, the smart card. You can, and will undoubtedly, find individuals who disagree with this demarcation. However, we find it to be the general consensus and will stick to this definition of a device throughout the remainder of the book.
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J2ME S ROLE IN WIRELESS AND MOBILE APPLICATIONS
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J2ME is often referred to as Java for wireless and mobile devices. While J2ME technology is used in many wireless and mobile devices, J2ME is not used exclusively in these environments. We do not want to diminish J2ME s role and importance in mobile and wireless applications. However, it is important to realize that J2ME is about more than mobile and wireless applications.
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Is J2ME mobile Mobile devices are defined as those computing devices that are small enough to be easily carried and used while in transport. They provide users with a portion of computing capabilities and information that is available from fixed information systems at home or their place of business. In general, most mobile devices allow themselves to be synchronized with the fixed systems for software and data updates. As an example, an office may have a customer management application that can provide sales force personnel with information on customers. A mobile device would likely allow a sales person to download a limited amount of customer data for a limited number of customers to use while on the road. Updates to any data on the mobile device would need to be reconciled with the office s customer management system on the sales person s return. Given this kind of definition, the term mobile is subject to change. In fact, there was a time when we may have called a twenty-pound laptop mobile. Certainly, many, but not all, of the devices that J2ME targets can be considered mobile. PDAs, cell phones, and so forth can certainly be considered mobile platforms when they are provided with
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software and data. However, set-top boxes, for example, are not meant to be mobile devices. While these devices can run J2ME programs, they are not mobile. Furthermore, many other Java technologies, J2SE and Java Card included, are running in mobile systems. So while J2ME is an important Java technology for mobile platforms, it is not the Java technology for mobile platforms. And Java is not the only solution. There are several technologies that provide mobile applications and data for mobile devices. In fact, many organizations provide tools for downloading a slice of corporate data to a personal device for use while not at the office. These are mobile solutions. The term mobile simply defines the capability or state of the device. So is J2ME mobile Because mobile devices are usually smaller and more resource constrained, J2ME is a viable development solution for these constrained devices. Therefore, J2ME can and often does play an important role in mobile devices, but the term mobile does not categorize all J2ME applications. 1.3.2 Is J2ME wireless A wireless device is simply a device capable of communicating or networking without wires or cable. Many J2ME devices are wireless. Cellular telephones, pagers, and pocket communicators are just some of the wireless communications devices that can use J2ME technology. The list of such devices is ever expanding. Many of today s laptops and PDAs provide wireless communication adapters to allow these devices to work in a wireless fashion. Wireless devices are intended to behave as if they were directly connected to the network with a wire. From a user s perspective, it should appear that any data or application is local to that device or directly connected to the device providing the data or application. For example, a sales person could use a cell phone to look up information on a customer from a customer management system back at the office. To the sales person, it might appear that the data and/or application obtaining and displaying the information is local to the phone when in reality, the data has merely been wirelessly transmitted to the sales person s device. However, there are several devices that J2ME targets that are not wireless. Again, set-top boxes, Internet screen telephones and televisions are usually wired. In fact, as we will see in future discussions, a large portion of J2ME is set aside for systems that are expected to have a reliable, rich, and high fidelity network connection, which today usually means having connectivity through a wire or cable. The J2ME technology supports many wireless devices, but it is not the Java technology for wireless computing. In fact, other technologies such as the Wireless Access Protocol and the Wireless Markup Language are meant to provide wireless capabilities to devices without necessarily providing mobile applications (chapter 15). Wireless defines the type of communications used by the device. J2ME, therefore, can be and often is an important part of a wireless solution. But while Java and J2ME may be used in wireless devices and applications, not all J2ME applications are wireless.
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