Java Programming Language

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Java
Java was developed at Sun Microsystems .It is an object-oriented programming language very similar to C++.But java is different from C++, as it is platform independent. Unlike other programa, which have platform constraints, java programs can be run on any machine with any operating system. All you need to do is first run the program and then complied it using the java compiler. Once your java program is compiled then it is ready to be executed on any platform.
A Compiler is a program that checks for syntactical/logical errors in a program. If it finds errors, then it reports them, else it makes an executable file of the program. In case of java, the compiler does not create a complete executable file; it creates a byte code file. This byte code file is interpreted by the java virtual machine, which is built within the browser.
Java is an ideal language for the Internet. Java was originally launched on a Web browser written in java itself, called the hot java browser. Internet and World wide wed developers and search engine optimization all over the world were attracted towards java because of it‘s power to merge interactivity with static HTML pages with cross platform compatibility. Learning hoe to program using java is a complete new area in itself. There are lots of books available and web sites too that aim just towards java development.
Java Applets
Java Applets are are small java programs that can be included inside an HTML page .So, when your page is viewed the applet is also downloaded and can be viewed from within the Web page. Netscape was the first browser to include the capability to execute java applets .Since then all major browsers have licensed java .Java has almost no limitation and can be used to create any kind of application as well. Java application work as standalone programs and can exist only on the server, while applets are basically inserted into an HTML page and are displayed within a browser .Applets are often used for creating dynamic and interactive web applications, though the true power of java lies in the application end.
To add a java applet to your web page, you need to use the tag. This tag will contain the java applet and using the HEIGHT and WIDTH attributes you specify how large or small the java applet box
JAVASCRIPT AND DYNAMIC HTML
We are now moving towards those aspects of web publishing that add more interactivty and make the web site more dynamic. JavaScript and DHTML are two such capabilities that can increase the impact of your Web site.
JavaScript
JavaScript is essentially a programming language used for adding interactive elements into a web page.