$ java
Usage: java [-options] class [arg1 arg2 ...]
                 (to run a class file)
   or  java [-options] -jar jarfile [arg1 arg2 ...]
                 (to run a standalone jar file)

where options include:
  -help            print out this message
  -version         print out version number and copyright information
  -showversion     show version number and copyright and continue
  -cp -classpath   <jar/zip files and directories separated by :>
                   locations where to find application classes
  -verbose[:class|gc|jni]
                   :class print out information about class loading, etc.
                   :gc print out results of garbage collection
                   :jni print out native method dynamic resolution
  -D<name>=<value> set a system property
  -X               show help on non-standard options