Why do I need J2SE if I can do everything with J2RE?

Hi,
I'm writing Java (with eclipse) for some time now, but I still don't understand why do I need to download J2SE ?
It seems that I can write code & run it with J2RE only... so what is the benefit of J2SE?
Thanks for your help...

Eclipse has a compiler in it, presumably. Or possibly it delegates to javac and you just haven't found it.
You don't need to have an external command-line compiler if you only want to compile code with Eclipse, although it certainly can be helpful to have a duplicate tool with a different interface sometimes.
Also the JDK (that is, the Java SDK, as opposed to the libraries; sometimes the terms are used interchangably) comes with other useful tools, like javap and jar.

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