# 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.