Uses of Class java.nio.channels.Selector (Java Platform SE 8 )
Date: 2026-08-19

## Uses of Class
java.nio.channels.Selector

- Packages that use Selector
  Package | Description
  --- | ---
  java.nio.channels | Defines channels, which represent connections to entities that are capable of performing I/O operations, such as files and sockets; defines selectors, for multiplexed, non-blocking I/O operations.
  java.nio.channels.spi | Service-provider classes for the ``java.nio.channels`` package.

- - ### Uses of Selector in java.nio.channels

    Methods in java.nio.channels that return Selector
    Modifier and Type | Method and Description
    --- | ---
    `static Selector` | Selector.`open()` Opens a selector.
    `abstract Selector` | SelectionKey.`selector()` Returns the selector for which this key was created.
    `abstract Selector` | Selector.`wakeup()` Causes the first selection operation that has not yet returned to return immediately.

    Methods in java.nio.channels with parameters of type Selector
    Modifier and Type | Method and Description
    --- | ---
    `abstract SelectionKey` | SelectableChannel.`keyFor(Selector sel)` Retrieves the key representing the channel's registration with the given selector.
    `SelectionKey` | SelectableChannel.`register(Selector sel, int ops)` Registers this channel with the given selector, returning a selection key.
    `abstract SelectionKey` | SelectableChannel.`register(Selector sel, int ops, Object att)` Registers this channel with the given selector, returning a selection key.

  - ### Uses of Selector in java.nio.channels.spi

    Subclasses of Selector in java.nio.channels.spi
    Modifier and Type | Class and Description
    --- | ---
    `class` | `AbstractSelector` Base implementation class for selectors.

    Methods in java.nio.channels.spi with parameters of type Selector
    Modifier and Type | Method and Description
    --- | ---
    `SelectionKey` | AbstractSelectableChannel.`keyFor(Selector sel)`
    `SelectionKey` | AbstractSelectableChannel.`register(Selector sel, int ops, Object att)` Registers this channel with the given selector, returning a selection key.

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