What are the diffrences among J2SE,J2EE, and J2ME ?

Could one explain me..what are these terms and terms like JDK,SDK and what are the diffrences and similarities.I have installed J2sdk1.4.1 in my computer.I have written some programs and run them.Applets too.What are the extra benifits that I can take if I install J2EE.In other words what are the things that J2SDK is lacking when compared to J2EE?
Please explain..I am quite new to java.
Regards..Saman

J2ME - Java 2, Micro Edition.
This is a specification, a developement platform for Java enable device, it is mostly for mobile devices,such as PDA, handphone.
J2SE - Java 2, Standard Edition
This is a specification, a developement platform for developing standard service, which is software. Such as graphic user interface, input output device, applet and more.
J2EE - Java 2 Enterprise Edition.
This is a specification, a developement platform for enterprise system, server side program. and examnple is Java Server Page, Java Servlet, Enterprise Java Bean and more.

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Experts:
Would you please help explain what are their differences?
I cannot find their definition.
Thanks a lot!

>
Ashley Ho wrote:
> Experts:
>
> Would you please help explain what are their differences?
>
> I cannot find their definition.
>
> Thanks a lot!
Hi Ashley,
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I mean in what condition I can use each of them?
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<>

is the same as:No it isn't (in example have used 3 instead of 25 so output is shorter:
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regards,

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and
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What are the diffrences among J2SE,J2EE, and J2ME ?

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