# 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.