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System Properties in JAVA December 15, 2006

Posted by Mayank in java.
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JAVA has some system properties which are available to all java applications. These properties contain information about the jvm, os, user, etc. The list of properties available in JDK 1.4.2 is –

Key Description of Associated Value
java.version Java Runtime Environment version
java.vendor Java Runtime Environment vendor
java.vendor.url Java vendor URL
java.home Java installation directory
java.vm.specification.version Java Virtual Machine specification version
java.vm.specification.vendor Java Virtual Machine specification vendor
java.vm.specification.name Java Virtual Machine specification name
java.vm.version Java Virtual Machine implementation version
java.vm.vendor Java Virtual Machine implementation vendor
java.vm.name Java Virtual Machine implementation name
java.specification.version Java Runtime Environment specification version
java.specification.vendor Java Runtime Environment specification vendor
java.specification.name Java Runtime Environment specification name
java.class.version Java class format version number
java.class.path Java class path
java.library.path List of paths to search when loading libraries
java.io.tmpdir Default temp file path
java.compiler Name of JIT compiler to use
java.ext.dirs Path of extension directory or directories
os.name Operating system name
os.arch Operating system architecture
os.version Operating system version
file.separator File separator (“/” on UNIX)
path.separator Path separator (“:” on UNIX)
line.separator Line separator (“\n” on UNIX)
user.name User’s account name
user.home User’s home directory
user.dir User’s current working directory

(reproduced from the J2SE v1.4.2 javadoc)

You can read these properties in your code like this :
String propertyValue = System.getProperty(“<propertyName>
“);

In order to learn more about the System Properties available in the release of JAVA you are using, please consult your JDKs javadoc for java.lang.System.

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