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Advise needed....

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i see there are 3 exams, developer, architect and component exams. in terms of technology what do these exams denote ?
like if someone asked me about scjp i would say it means that one knows the details of the language and basics of java programming, ability to understand and use api etc.
what exams can one take after scjp ?
the other question i have is about the kinds of applications that are being in java. i know this is a broad question, but i need to know, so i hope i asked this at the right place.
one specific area where i know first hand is use of java in GUI development. like, using java, the front end to applications were written, (or rewritten) displacing the windows GUI. (though the core backend, the real processing application still remained native win32)...
so if someone could let me know more about some applications where java was used or is being used, via, say, personal experience or etc.
any other information that you would like to share please do so. specially applications where java is used for networking applications.
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Java can also be used to crete Web Applications using Servlets and JSP. and also conenct them to EJB which can act as middle tier objects for accessing backend databases, and present the data to the front-end.
SCJD Developer shows you can practically use the standard APIs,
SCWCD web develoepr shows you know the Servlet and JSP APIs. It is a test like the SCJP in that there are 59 multiple choice, fillin the blanks, questions.
SCJA Architect is an overall design ability. 3 parts. First part is an exam of questions. There are questions on designing systems, using EJB, Corba, Legacy Systems. And also some Design patterns and UML.
Second Part. The assignment is to design such a system, and you have to use UML diagramming. The
Third part is an essay exam, which like the essay in the SCJD is to prove that you did your own work
Consider Paul's rocket mass heater.
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