First Time I download

[jorma1998b]

Hi there, experts. I'm new to Java and trying to download it right. First question is, ok,most computers run java and therefore, have it downloaded, and updated on a regular base. Therefore, why downloaded again?
I don't even know where exactly is Java stored, in what folder or directory.
Also, assuming I need JDK for development purposes, I'd like to store it separately, what would be a good directory?

[SJF]

Most times people refer to having Java installed, they are referring to the JRE (Java Runtime Environment). This allows programs written in Java to run on that machine. If you intend to program in Java, you will need the JDK (Java Development Kit) which includes the JRE, but also includes the Java Compiler (among other things).

As far as where it is stored depends on many things, not the least of which is what operating system you're running. You can have multiple JREs (and, for that matter JDKs) installed on the same machine if you want.

Windows default installation: C:\Program Files\Java\jreXXXXXXX for JRE (XXXXXXXX = version # i.e. jre1.5.0_21 or jre7)
C:\Program Files\Java\jdkXXXXXXX for JDK

on 64-bit windows with 32-bit java they will be in C:\Program Files x86\ by default. MacOS and Linux there should be a link from /usr/bin/java to the default java install

[DarrylBurke]

what would be a good directory?

The default one, chosen by the install file. Or do you have a good reason to not want to use that?

db

[jorma1998b]

Thanks for a great answer.
Perhaps if I say that i have an ordinary Dell Inspiron with Windows 7, then what i would like to have is a separate storage of JDK vrs. the standard version that comes with most computers. Assuming that I do, would JDK be subject to constant automatic updates by Oracle?
Also, is it advisable to download Eclipse? I read you can train yourself with that piece of software.
Finally, is it advisable to buy Java for dummies 2011 with Java 7? or would you suggest another book?
Appreciate your support.

[Tolls]

The jre is stored in one location, and the jdk in another.
Usually "Program Files/Java/JDK" and "Program Files/Java/JRE".
The JDK does not get auto updates.