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JRE vs JDK

Posted on 2000-03-18
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Last Modified: 2013-11-23
What is the difference between JDK and JRE?  I am looking to install Oracle which requires JRE, but says NOT to get JDK.  However, I want JDK so that I can code java.  Can both coexist?
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Question by:slyph
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3 Comments
 
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Expert Comment

by:Sasha_Mapa
ID: 2632238
I think JRE is a part of the JDK, at least I have JDK installed on my comp, never had JRE even downloaded, and I have it (I can double click on JAR files to run them for example)
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Accepted Solution

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saifikhan earned 50 total points
ID: 2632244
Hi:
JDK is the Java Development Kit.
It is a fat installable that comes
with the
rt.jar
the libraries
the binaries
Demo programs
include header files(.h)
the JRE
and some docs.

JRE is the Java Runtime Environment
which contains the following:
1. binary executables
2. library which contains the required jars.
JRE is the light-weight version of the actual JDK install.

The two are downloadable from java.sun.com site separately.

In your Oracle installation you need to install a particular version of JRE, say 1.2.2 . Now if you have already installed JDK 1.2.2 (~22MB)then you can go ahead and install Oracle.
But, if you haven't installed JDK1.2.2, then the bare minimum requirement is that you install JRE 1.2.2 (~5MB)

Hope this helps.

Saifi.
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Author Comment

by:slyph
ID: 2632261
Perfect, thanks!
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