| Property Name | Description | Java Version |
| file.encoding | The character encoding for the default locale | 1.1 |
| file.encoding.pkg | The package that contains the converters that handle converting between local encodings and Unicode | 1.1 |
| file.separator | The platform-dependent file separator (e.g., "/" on UNIX, "\" for Windows) | 1.0 |
| java.class.path | The value of the CLASSPATH environment variable | 1.0 |
| java.class.version | The version of the Java API | 1.0 |
| java.compiler | The just-in-time compiler to use, if any. The java interpreter provided with the JDK initializes this property from the environment variable JAVA_COMPILER. | 1.0 |
| java.home | The directory in which Java is installed | 1.0 |
| java.tempdir | The directory in which java should create temporary files | 1.2 |
| java.version | The version of the Java interpreter | 1.0 |
| java.vendor | A vendor-specific string | 1.0 |
| java.vendor.url | A vendor URL | 1.0 |
| line.separator | The platform-dependent line separator (e.g., "\n" on UNIX, "\r\n" for Windows) | 1.0 |
| os.name | The name of the operating system | 1.0 |
| os.arch | The system architecture | 1.0 |
| os.version | The operating system version | 1.0 |
| path.separator | The platform-dependent path separator (e.g., ":" on UNIX, "," for Windows) | 1.0 |
| user.dir | The current working directory when the properties were initialized | 1.0 |
| user.home | The home directory of the current user | 1.0 |
| user.language | The two-letter language code of the default locale | 1.1 |
| user.name | The username of the current user | 1.0 |
| user.region | The two-letter country code of the default locale | 1.1 |
| user.timezone | The default time zone | 1.1 |