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If there is a security manager, its checkPropertiesAccess method is called with no arguments. This may result in a security exception.
The current set of system properties is returned as a Properties object. If there is no current set of system properties, a set of system properties is first created and initialized.
This set of system properties always includes values for the following keys:
| Key | Description of Associated Value |
|---|---|
| java.version | Java version number |
| java.vendor | Java vendor-specific string |
| java.vendor.url | Java vendor URL |
| java.home | Java installation directory |
| java.class.version | Java class format version number |
| java.class.path | Java class path |
| 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 |