Java

Version output

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Join Date: Feb 2005

Posts: 78

Reputation: nanodano is an unknown quantity at this point

Solved Threads: 2

nanodano

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Junior Poster in Training

Version output

Aug 3rd, 2007

I've been trying to find a function that returns the version number of the JVM. I found this website that does it, so I know it can be done:

http://www.javatester.org/version.html

Can anyone help me out?

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Join Date: May 2007

Posts: 4,508

Reputation: Ezzaral has a brilliant future

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Ezzaral

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Industrious Poster

Re: Version output

Aug 3rd, 2007

"java -version" from the command line or System.getProperty("java.specification.version");
From the docs on this system property

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The requirement to identify the Java Runtime is already partially met via the properties specified by the Java Language Specification, §20.18.7 using java.lang.System.getProperties.
java.version i.e. Solaris 1.2

java.vendor i.e. Sun Microsystems Inc.

Currently these identify the implementation of the Java runtime and the core classes that are available. These properties do not identify the Java Language Specification version that this JDK implements.
Additional properties are needed to identify the version of the Java Runtime Environment specification that this implementation adhere’s to. The properties are:
java.specification.version i.e. 1.1

java.specification.name i.e. Java™ Language Specification

java.specification.vendor i.e. Sun Microsystems Inc.

These properties are accessed using the method java.lang.System.getProperty and return their values as strings.