100 * @see #removeShutdownHook
101 * @see #runFinalizersOnExit
102 * @see #halt(int)
103 */
104 public void exit(int status) {
105 SecurityManager security = System.getSecurityManager();
106 if (security != null) {
107 security.checkExit(status);
108 }
109 Shutdown.exit(status);
110 }
111
112 /**
113 * Registers a new virtual-machine shutdown hook.
114 *
115 * <p> The Java virtual machine <i>shuts down</i> in response to two kinds
116 * of events:
117 *
118 * <ul>
119 *
120 * <p> <li> The program <i>exits</i> normally, when the last non-daemon
121 * thread exits or when the <tt>{@link #exit exit}</tt> (equivalently,
122 * <tt>{@link System#exit(int) System.exit}</tt>) method is invoked, or
123 *
124 * <p> <li> The virtual machine is <i>terminated</i> in response to a
125 * user interrupt, such as typing <tt>^C</tt>, or a system-wide event,
126 * such as user logoff or system shutdown.
127 *
128 * </ul>
129 *
130 * <p> A <i>shutdown hook</i> is simply an initialized but unstarted
131 * thread. When the virtual machine begins its shutdown sequence it will
132 * start all registered shutdown hooks in some unspecified order and let
133 * them run concurrently. When all the hooks have finished it will then
134 * run all uninvoked finalizers if finalization-on-exit has been enabled.
135 * Finally, the virtual machine will halt. Note that daemon threads will
136 * continue to run during the shutdown sequence, as will non-daemon threads
137 * if shutdown was initiated by invoking the <tt>{@link #exit exit}</tt>
138 * method.
139 *
140 * <p> Once the shutdown sequence has begun it can be stopped only by
141 * invoking the <tt>{@link #halt halt}</tt> method, which forcibly
142 * terminates the virtual machine.
143 *
144 * <p> Once the shutdown sequence has begun it is impossible to register a
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100 * @see #removeShutdownHook
101 * @see #runFinalizersOnExit
102 * @see #halt(int)
103 */
104 public void exit(int status) {
105 SecurityManager security = System.getSecurityManager();
106 if (security != null) {
107 security.checkExit(status);
108 }
109 Shutdown.exit(status);
110 }
111
112 /**
113 * Registers a new virtual-machine shutdown hook.
114 *
115 * <p> The Java virtual machine <i>shuts down</i> in response to two kinds
116 * of events:
117 *
118 * <ul>
119 *
120 * <li> The program <i>exits</i> normally, when the last non-daemon
121 * thread exits or when the <tt>{@link #exit exit}</tt> (equivalently,
122 * {@link System#exit(int) System.exit}) method is invoked, or
123 *
124 * <li> The virtual machine is <i>terminated</i> in response to a
125 * user interrupt, such as typing <tt>^C</tt>, or a system-wide event,
126 * such as user logoff or system shutdown.
127 *
128 * </ul>
129 *
130 * <p> A <i>shutdown hook</i> is simply an initialized but unstarted
131 * thread. When the virtual machine begins its shutdown sequence it will
132 * start all registered shutdown hooks in some unspecified order and let
133 * them run concurrently. When all the hooks have finished it will then
134 * run all uninvoked finalizers if finalization-on-exit has been enabled.
135 * Finally, the virtual machine will halt. Note that daemon threads will
136 * continue to run during the shutdown sequence, as will non-daemon threads
137 * if shutdown was initiated by invoking the <tt>{@link #exit exit}</tt>
138 * method.
139 *
140 * <p> Once the shutdown sequence has begun it can be stopped only by
141 * invoking the <tt>{@link #halt halt}</tt> method, which forcibly
142 * terminates the virtual machine.
143 *
144 * <p> Once the shutdown sequence has begun it is impossible to register a
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