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Process management class lectures_6813785-JavaClass-lecture1

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Introduction to Java Lecture 1 School of Computer Science psaxena.scs@dauniv.ac.in Topics • • • • • • About JAVA Features of Java How it is different from C, C++ Introduction to Java Virtual Machine Present the syntax of Java Data types Example programs 28 March 2007 Java : Lecture 1 2 History of Java • Java – Originally for intelligent consumer-electronic devices – Then used for creating Web pages with dynamic content – Now also used to: • Develop large-scale enterprise applications • Enhance WWW server functionality • Provide applications for consumer devices (cell phones, etc.) 28 March 2007 Java : Lecture 1 3 Why Java? • Because of its design goals , which are summarized in the form of several keywords: – Java is simple – It’s almost entirely object-oriented – It’s distributed – It’s more platform independent & architectural neutral • this makes it great for Web programming – – – – – It’s more secure It’s robust It’s multithreaded It’s Portable It’s Interpreted 28 March 2007 Java : Lecture 1 4 Java Programs : Applets, Servlets and Applications • An applet is designed to be embedded in a Web page and run by a browser • Applets run in a sandbox with numerous restrictions; for example, they can’t read files • A servlet is designed to be run by a web server • An application is a conventional program 28 March 2007 Java : Lecture 1 5 How it is different from C++ No preprocessor. ...
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