# Uses of Interface
java.nio.file.WatchKey

Packages that use WatchKey
Package | Description
--- | ---
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
Modifier and Type | Method | Description
--- | --- | ---
`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.