The Java platform uses a Properties object to maintain its own configuration.
Access to system properties can be restricted by the Security Manager.
when starting the JVM
java -Dname=value ......
System.setProperty("name","value");
String value = System.getProperty("name");
| 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 |