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Java Programming Questions

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29. What are the components of J2EE application?
  A J2EE component is a self contained functional software until that is assembled into a J2EE application with its related classes and files and communicates with other components. The J2EE specification defines the following J2EE components.
  • Application clients and applets are client components.
  • Java Servlet and JavaServer Pages technology components are web components.
  • Enterprise JavaBeans components are business components.
  • Resource adapter components provided by EIS and tool vendors.
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30. What are the different Java platform editions?
  • Java 2 Platform, Standard Edition (J2SE)
  • Java 2 Platform, Enterprise Edition (J2EE)
  • Java 2 Platform, Micro Edition (J2ME)
Java 2 Platform, Standard Edition (J2SE): J2SE is used to develop stand alone/desktop portable java applications. J2SE consists of two components. Core component and desktop component.
Core component : provides back end functionality.
Desktop component: provides GUI functionality.
J2SE consist of Java Development Kit and Java Runtime Environment.
JDK consists of java compiler and other related tools to enable the users to create Java Applications.
Java Runtime Environment consists of java virtual machine, libraries and all other components that are necessary to run a java application.
Java 2 Platform, Enterprise Edition (J2EE) : J2EE is a platform to develop multitier enterprise applications.
JEE includes Servlets API, Java Server Pages and Enterprise Java Beans. It was built on J2SE technology.
Java 2 Platform, Micro Edition (J2ME) : is the technology for microelectronic devices like PDAs, Mobile phones etc.
J2ME supports the flexibility for user interfaces provides the security and uses the built in network protocols for networked applications. J2ME applications can be ported across different devices.
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31. What is Java IDL?
  A technology that provides CORBA interoperability and connectivity capabilities for the J2EE platform. These capabilities enable J2EE applications to invoke operations on remote network services using the Object Management Group IDL and IIOP.
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32. What is the difference between HttpServlet and GenericServlet?
  GenericServlet has a service() method aimed to handle requests. HTTPServlet extends GenericServlet and adds support for do Get(), doPost(), doHead() methods plus doPut(), doOptions(), doDelete(), doTrace() methods. Both these classes are abstract.
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