Which system properties can I check?

Here is a listing of system properties to check:

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: (":" 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