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Make Sence of Java and its Acronyms

Posted on 2011-09-08
Medium Priority
Last Modified: 2012-05-12
Hi Experts,

   I am a software engineer with 10+ years of Microsoft programming experience.  VB, VC++, .NET, etc.  I am currently trying to teach myself Java and I have the hardest time making sense of the basics.

Here's what I think I know:

When I write code I create simple text files (.java).  Then I use something to compile it into bytecode files (.class) and then these bytecode files are interpreted at execution time by an OS specific Java Virtual Machine.

Here are my questions:

Am I correct in my above understanding?
What do I use to compile my .java files?
Is there a difference between JRE and JVM?
What is the difference between JDK and Java SDK?
Does the JDK contain both the compiler and the JVM?
When I download and install an IDE like Eclipse, does that also install the compiler and the JVM?
What is a Java Application Server?

Why does the Java community insist on having 15 different acronyms/names for the same piece of software and/or technology?  ¿

I know that these are a lot of questions but they should be rather simple for an expert.

Question by:axnst2
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LVL 47

Accepted Solution

for_yan earned 2000 total points
ID: 36503925
Yes you are correct

You use compileer javac which comes wityh JDK (development kit) not JRE (runtime kit)

JRE and JVM more or less the same - JRE - the whole environmet, files, directory structure, etc.
JVM - usually the process which is running and interpreting

Yes, JDK contains compiler

No, you should install JJDK separately from Eclipse form Oracle website

LVL 47

Expert Comment

ID: 36503945

TYhat's where you download Java

You can download Java bundled with NetBeans bexcause NetBeans is developed by the same Oracle,
but for Eclipse you download independently and you need to download JDK separately

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Expert Comment

ID: 36503950
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LVL 47

Expert Comment

ID: 36503989

Java is not so strictly controlled by one company like MS stuff, so the number of names and acronyms
maybe a little bit bigger - compare democracy with totalitarian society and you'll find much more diversity in everytihing
in democratic state, including the naming. Well, some inconvenience, but not too big a price to pay for the freedom.
LVL 47

Expert Comment

ID: 36504083
I by no means  meant to offend anyone by my previous remark - after all in some cases more authoritative power is indeed more effective.

Author Comment

ID: 36504541
No apologies necessary!  I think it was a very good comparison!

I understand that I am trading some things for others when leaving the proprietary world and i am OK with that!  No one is forcing me to do it, right?  :)  I just wanted to make sure that I got my facts straight!  Thanks for your help!

Author Closing Comment

ID: 36504545
LVL 47

Expert Comment

ID: 36504555
You are always welcome..
And thanks for your nice attitude.

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