Java: Spicing Up the Web in Java

Paint Quick Response Code in Java Java: Spicing Up the Web
Java: Spicing Up the Web
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HTML-based Web pages are certainly a big step up from using the obscure, text-based Unix incantations of ftp, news, gopher, wais, and telnet to get around on the Net; however, they also have a major drawback.
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Much like the page that you are reading now, Web pages are static. Wouldn't it be better to have interactive Web pages that dynamically change themselves according to feedback from a user Wouldn't it be better to program your Web pages to accept input, compute results, and then display them This sort of dynamic activity should ring a bell. After all, programming languages allow people to program machines to do just these sorts of things. Why not make a programming language for the Web That is the essence of Java. Java is a full-featured programming language that allows programmers to compose executable content for the Web. The Java language is designed to be usable on all platforms so that code can move from one machine to another and still work, regardless of the kind of machine it ends up on. Cross-platform compatibility has always been a stumbling block in previous attempts to create programming languages for executable content. Mobile code can only truly be mobile if it can be executed on all platforms without porting and recompiling! In order to allow Java to run on a computer, the administrator must first install a Java Virtual Machine (JVM), or a browser that includes a Java VM. The JVM interprets Java instructions and translates them into machine-specific instructions. This allows Java to be run on many different types of machines.4 For old timers, the whole idea is reminiscent of P-code from the 1970s. Having a well-defined, platform-independent definition allows Java to get around problems that have plagued the C programming language, making C less platform independent than its designers intended. Unlike C programs, Java programs are not hampered by machine-dependent structures such as:
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q q q
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Byte ordering (low or high endian) Pointer size (16 or 32 bit) Integer size (16 bit, 32 bit, or 64 bit)
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Java's careful definition shields it from these platform-specific elements of programming. Each Java VM is written to a specific platform and translates the more generic Java instructions into platform-specific instructions. Java has upped the ante on the Web. The best Web pages now include Java applets that do everything from displaying selectable news tickers to providing front-end graphical user interfaces (GUIs) for internal databases. There are even some Web-based videogames written in Java. Java applets have become commonplace.
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The Promise of Java
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Java is by far the most popular implementation of Web-based mobile code. Lesser-known competitors include JavaScript, Safe-Tcl, Telescript, Word macros, Excel macros, ActiveX, and Postscript. Each of these systems raises its own security issues. Any document-embedded scripting language that can be transferred around the Net and run on different machines falls under the classification of executable
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content.5 Propelled by the marketing powers of Sun Microsystems and IBM, the Java wave is still building. Java avoids the interactive content limitations that were built in to forms and CGI (Common Gateway Interface) scripts.6 Java's power lies in the ability to program complete applications in a real programming language that can then be dynamically distributed and run by virtually any user over the Web.
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... Preface -- 1 -- 2 -- 3 -- 4 -- 5 -- 6 -- 7 -- 8 -- 9 -- A -- B -- C -- Refs Front -- Contents -- Help
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Copyright 1999 Gary McGraw and Edward Felten. All rights reserved. Published by John Wiley & Sons, Inc.
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Mobile Code and Security: Why Java Security Is Important
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CHAPTER SECTIONS: 1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 / 10
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