Method add

ZezeJava/ZezeJava/src/main/java/Zeze/Util/ShutdownHook.java:46–48

(@NotNull Action0 action)

	}

	public static void add(@NotNull Action0 action) {
		add(new Object(), action);
	}

	public static void add(@NotNull Object key, @NotNull Action0 action) {
		shutdownActionsLock.lock();