## Uses of Interface
java.nio.file.WatchKey

Packages that use WatchKey
java.nio.file: Defines interfaces and classes for the Java virtual machine to access files, file attributes, and file systems.

### Uses of WatchKey in java.nio.file

Methods in java.nio.file that return WatchKey
`WatchKey` WatchService.`poll()` Retrieves and removes the next watch key, or `null` if none are present.
`WatchKey` WatchService.`poll(long timeout, TimeUnit unit)` Retrieves and removes the next watch key, waiting if necessary up to the specified wait time if none are yet present.
`default WatchKey` Path.`register(WatchService watcher, WatchEvent.Kind<?>... events)` Registers the file located by this path with a watch service.
`WatchKey` Path.`register(WatchService watcher, WatchEvent.Kind<?>[] events, WatchEvent.Modifier... modifiers)` Registers the file located by this path with a watch service.
`WatchKey` Watchable.`register(WatchService watcher, WatchEvent.Kind<?>... events)` Registers an object with a watch service.
`WatchKey` Watchable.`register(WatchService watcher, WatchEvent.Kind<?>[] events, WatchEvent.Modifier... modifiers)` Registers an object with a watch service.
`WatchKey` WatchService.`take()` Retrieves and removes next watch key, waiting if none are yet present.