Introduction in Java

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1 Introduction
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Section 11 The Wireless Internet Revolution Section 12 Why Java Technology for Wireless Devices Section 13 A Bit of History Section 14 J2ME Standardization Efforts [ Team LiB ]
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11 The Wireless Internet Revolution
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The wireless communications industry has seen rapid growth in the past several years This has made wireless communication one of the fastest growing technology areas in the world The total number of cellular phone subscribers worldwide exceeded one billion in 2002, and it has been estimated that there will be over 15 billion wireless subscribers in the world by 2005 This far exceeds the number of personal computer users in the world, which was estimated to be about 500 million in 2002 The total annual sales of cell phones in the world is expected to grow from about 423 million phones sold in 2002 to nearly 600 million phones sold in 2006
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At the same time, the rapid emergence of the Internet has changed the landscape of modern computing People have become more and more dependent on the information that is available on the Internet, and they will increasingly want to access the Internet not only from their personal computers and office workstations but also from mobile, wireless devices Consequently, the rapid and efficient deployment of new wireless data and mobile Internet services has become a high priority for communication equipment manufacturers and telecommunication operators
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The transition to wireless, mobile Internet devices will fundamentally alter the landscape and architecture of communication networks, devices, and services Unlike in the past, when wireless devices typically came from the factory with a hard-coded feature set, the devices will become more and more customizable The possibility to download new applications and features over wireless networks will open up completely new possibilities for device manufacturers, network operators, service and content providers, and device users themselves
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The wireless Internet revolution will be facilitated by another important technological advance: the introduction of broadband third- and fourth-generation wireless networks While current wireless networks have limited data rates, allowing the users to transfer only up to a few tens of kilobits of data per second, broadband wireless networks will provide data rates ranging from hundreds of kilobits up to several megabits per second This will provide enough bandwidth to transfer photographs, live video, and high-quality audio, as well as to download significantly larger applications and services than today
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All these changes will happen relatively fast Even though it will still take a few years before broadband wireless networks are in widespread use, it is safe to estimate that the majority of new wireless devices will have high-speed connectivity to the Internet by the end of the decade [ Team LiB ]
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12 Why Java Technology for Wireless Devices
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The wireless Internet revolution will transform wireless devices from voice-oriented communication devices with relatively static, hard-coded functionality into extensible, Internet-enabled devices with advanced data and software capabilities These devices will need to support dynamic downloading of new software and be capable of running software written not only by the device manufacturers themselves but also by third-party software developers This will make the devices much more dependent on software and will place a much higher emphasis on software interoperability, security, and reliability
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The Java programming language is ideally suited to become the standard application development language for wireless devices After all, the Java platform provides a number of important benefits: Dynamic delivery of content New applications, services, and content can be downloaded dynamically over different kinds of networks
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Security Class file verification, well-defined application programming interfaces, and security features ensure that third-party applications behave reliably and cannot harm the devices or the networks
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Cross-platform compatibility Standardized language features and libraries mean that applications and content can be transferred flexibly between different devices, within constraints of the supported J2ME configuration and profiles (see Section 23, "Key Concepts of the J2ME Architecture," for details)
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Enhanced user experience and interactive content The standards defined for wireless Java technology support sophisticated user interaction and provide compelling graphics capabilities for small devices
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Offline access Applications can also be used without active network connection This reduces transport costs and alleviates the impact of possible network failures
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The power of a modern object-oriented programming language The Java programming language has far better abstraction mechanisms and higher-level programming constructs than other languages and tools that are currently used for wireless software development, allowing applications to be developed more efficiently
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Large developer community It is estimated that there are more than three million Java software developers worldwide The Java programming language is rapidly becoming the most popular programming language taught in schools and universities The developer talent needed for Java software development already exists and is readily available
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Ultimately, Java technology will deliver far more compelling, entertaining, and engaging capabilities to wireless devices What is particularly important is that this can be accomplished incrementally, by complementing existing technologies and standards, rather than by competing with them One of the key points we emphasize throughout this book is that we are not defining a new operating system or a complete system software stack for wireless devices
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