Java Environment Properties

Exploring java.lang > System >
Siva Nookala - 06 Oct 2016

In Environment Properties, we examined the way an application can use Properties objects to maintain its configuration. The Java platform itself uses a Properties object to maintain its own configuration.

The following properties are available in all cases.

Key	Meaning
`file.separator`	Character that separates components of a file path. This is "/" on UNIX and "\" on Windows.
`java.class.path`	Path used to find directories and JAR archives containing class files. Elements of the class path are separated by a platform-specific character specified in the path.separator property.
`java.home`	Installation directory for Java Runtime Environment (JRE).
`java.vendor`	JRE vendor name.
`java.vendor.url`	JRE vendor URL.
`java.version`	JRE version number.
`line.separator`	Sequence used by operating system to separate lines in text files.
`os.arch`	Operating system architecture.
`os.name`	Operating system name.
`os.version`	Operating system version.
`path.separator`	Path separator character used in java.class.path.
`user.dir`	User working directory.
`user.home`	User home directory.
`user.name`	User account name.
`getProperty(String which, String default)`	Returns the property associated with `which`. If the desired property is not found, `default` is returned
`getProperty(String which)`	Returns the property associated with `which`. A `null` object is returned if the desired property is not found.
`setProperty(String which, String v)`	Assigns the value `v` to the property named `which.`
`clearProperty(String which)`	Deletes the environmental variable specified by `which`. The previous value associated with `which` is returned

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