I see many different Java terms floating around. I need to install the JDK 1.6. It was my understanding that Java 6 == Java 1.6. However, when I install Java SE 6, I get a JVM that reports as version 11.0!!!??! Who can solve the madness?
We need another up arrow that instead of saying "that was helpful" says "That was sooooo true".
Paul Tomblin
2008-10-30 15:28:34
Yeah, I wasn't trying to be helpful, but the way Joe phrased his question: "Who can solve this madness?" I couldn't resist.
Elie
2008-10-30 15:32:22
Sun could solve the madness, but don't look likely to do so. SunOS/Solaris is another example of their version numbering, er, policy.
Mark Baker
2008-10-30 15:43:06
+8
A:
- JDK - Java Development Kit
- JRE - Java Runtime Environment
- Java SE - Java Standard Edition
SE defines a set of capabilities and functionalities; there are more complex editions (Enterprise Edition - EE) and simpler ones (Mobile Edition - ME - for mobile environments).
The JDK includes the compiler and other tools needed to develop Java applications; JRE does not. So, to run a Java application someone else provides, you need JRE; to develop a Java application, you need JDK.
Edited: As Chris Marasti-Georg pointed out in a comment, you can find out lots of information at Sun's Java web site, and in particular from the Java SE section, (2nd option, Java SE Development Kit (JDK) 6 Update 10).
Jonathan Leffler
2008-10-30 15:13:12
So, if I need JDK 1.6, what do I install? Installing Java SE 6 gives me a JVM that reports as version 11.0!
Joe Schneider
2008-10-30 15:15:01
You need to go to sun and download JDK 1.6 or 6, whatever they have it listed as.
Chris Marasti-Georg
2008-10-30 15:17:24
I believe that what comes with Java SE 6 should be the correct JDK, despite internal version number differences.
Jonathan Leffler
2008-10-30 15:17:46
http://java.sun.com/javase/downloads/index.jsp 2nd option, Java SE Development Kit (JDK) 6 Update 10
Chris Marasti-Georg
2008-10-30 15:18:17
+5
A:
When you type "java -version", you see three version numbers - the java version (on mine, that's "1.6.0_07"), the Java SE Runtime Environment version ("build 1.6.0_07-b06"), and the HotSpot version (on mine, that's "build 10.0-b23, mixed mode"). I suspect the "11.0" you are seeing is the HotSpot version.
Update: HotSpot is (or used to be, now they seem to use it to mean the whole VM) the just-in-time compiler that is built in to the Java Virtual Machine. God only knows why Sun gives it a separate version number.
Paul Tomblin
2008-10-30 15:19:09
So, what is the difference between JVM 1.6 and JVM 11.0? What is hotspot?
Joe Schneider
2008-10-30 15:23:00
Actually HotSpot isn't a JIT. JIT implies that compilation takes place before execution. HotSpot first uses intepretation to execute and analyze the code before compiling/optimizing selected parts of the program.
John Nilsson
2010-09-07 15:20:26