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JAVA INTERVIEW QUESTION & ANSWERS

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1. What is Java and their uses?
 
  • Java is an object programming language that was designed to be portable across multiple platforms and operating systems.
  • Developed by Sun Microsystems.
  • Java is modeled after the C++ programming language and includes special features that make it ideal for programs on the Internet.
  • Java makes it easy to put interactive graphics and other special effect on a World Wide Web Pages.
  • Special programs, called applets, execute inside a web page with a capacity matching that of any traditional program.
  • Furthermore, when you run a Java applet, the remote server, Java transmits the applet to your browser across the Internet.
  • So rather than going out to a computer store to but software, Java applets let you download applications automatically when you need them.
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2. What is RMI?
  Remote Method Invocation. A technology that allows an object running in one Java virtual machine to invoke methods on an object running in a different Java virtual machine.
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3. What is the Java IDL System?
 
  • The Interface Definition Language (IDL) is an industry standard format useful for letting a Java client transparently invoking existing IDL object that reside server.
  • In addition, it allows a Java server to define objects that can be transparently invoked from IDL clients.
  • The Java IDL system lets you define remote interfaces using the IDL interface definition language which you can then compile with the idlgen stub generator tool to generate Java interface definitions and Java client and server stubs.
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4. What are filters in java?
 
  • Filters are nothing but simple java classes which can manipulate request before it reaches the resource on the web server.
  • Resource can be a HTML file, servlet class, JSP etc.
  • It can also intercept responses sent back to client and thus can manipulate the response before they reach the client browser.
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