76      /**
    77       * Terminates the currently running Java virtual machine by initiating its
    78       * shutdown sequence.  This method never returns normally.  The argument
    79       * serves as a status code; by convention, a nonzero status code indicates
    80       * abnormal termination.
    81       *
    82       * <p> All registered {@linkplain #addShutdownHook shutdown hooks}, if any,
    83       * are started in some unspecified order and allowed to run concurrently
    84       * until they finish.  Once this is done the virtual machine
    85       * {@linkplain #halt halts}.
    86       *
    87       * <p> If this method is invoked after all shutdown hooks have already
    88       * been run and the status is nonzero then this method halts the
    89       * virtual machine with the given status code. Otherwise, this method
    90       * blocks indefinitely.
    91       *
    92       * <p> The {@link System#exit(int) System.exit} method is the
    93       * conventional and convenient means of invoking this method.
    94       *
    95       * @param  status
    96       *         Termination status.  By convention, a nonzero status code
    97       *         indicates abnormal termination.
    98       *
    99       * @throws SecurityException
   100       *         If a security manager is present and its
   101       *         {@link SecurityManager#checkExit checkExit} method does not permit
   102       *         exiting with the specified status
   103       *
   104       * @see java.lang.SecurityException
   105       * @see java.lang.SecurityManager#checkExit(int)
   106       * @see #addShutdownHook
   107       * @see #removeShutdownHook
   108       * @see #halt(int)
   109       */
   110      public void exit(int status) {
   111          SecurityManager security = System.getSecurityManager();
   112          if (security != null) {
   113              security.checkExit(status);
   114          }
   115          Shutdown.exit(status);
   116      }