# AbstractSelectionKey
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
Summary:[Inherited Constants](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#inhconstants)\|[Protected Ctors](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#proctors)\|[Methods](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#pubmethods)\|[Inherited Methods](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#inhmethods)
# AbstractSelectionKey
`
public
abstract
class
AbstractSelectionKey
`
`
``
extends `[SelectionKey](https://developer.android.com/reference/java/nio/channels/SelectionKey)`
``
`
|---|---|--------------------------------------------|
| [java.lang.Object](https://developer.android.com/reference/java/lang/Object) |||
| ↳ | [java.nio.channels.SelectionKey](https://developer.android.com/reference/java/nio/channels/SelectionKey) ||
| | ↳ | java.nio.channels.spi.AbstractSelectionKey |
*** ** * ** ***
Base implementation class for selection keys.
This class tracks the validity of the key and implements cancellation.
## Summary
| ### Inherited constants |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| From class[java.nio.channels.SelectionKey](https://developer.android.com/reference/java/nio/channels/SelectionKey) |-------|--------------------------------------------------------------------------------------------------------------------------------------------------| | `int` | [OP_ACCEPT](https://developer.android.com/reference/java/nio/channels/SelectionKey#OP_ACCEPT) Operation-set bit for socket-accept operations. | | `int` | [OP_CONNECT](https://developer.android.com/reference/java/nio/channels/SelectionKey#OP_CONNECT) Operation-set bit for socket-connect operations. | | `int` | [OP_READ](https://developer.android.com/reference/java/nio/channels/SelectionKey#OP_READ) Operation-set bit for read operations. | | `int` | [OP_WRITE](https://developer.android.com/reference/java/nio/channels/SelectionKey#OP_WRITE) Operation-set bit for write operations. | |
| ### Protected constructors ||
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---|
| ` `[AbstractSelectionKey](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#AbstractSelectionKey())`() ` Initializes a new instance of this class. |
| ### Public methods ||
|------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| ` final void` | ` `[cancel](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#cancel())`() ` Cancels this key. |
| ` final boolean` | ` `[isValid](https://developer.android.com/reference/java/nio/channels/spi/AbstractSelectionKey#isValid())`() ` Tells whether or not this key is valid. |
| ### Inherited methods |
|-----------------------|---|
| From class` `[java.nio.channels.SelectionKey](https://developer.android.com/reference/java/nio/channels/SelectionKey)` ` |--------------------------------------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` final `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[attach](https://developer.android.com/reference/java/nio/channels/SelectionKey#attach(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` ob) ` Attaches the given object to this key. | | ` final `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[attachment](https://developer.android.com/reference/java/nio/channels/SelectionKey#attachment())`() ` Retrieves the current attachment. | | ` abstract void` | ` `[cancel](https://developer.android.com/reference/java/nio/channels/SelectionKey#cancel())`() ` Requests that the registration of this key's channel with its selector be cancelled. | | ` abstract `[SelectableChannel](https://developer.android.com/reference/java/nio/channels/SelectableChannel) | ` `[channel](https://developer.android.com/reference/java/nio/channels/SelectionKey#channel())`() ` Returns the channel for which this key was created. | | ` abstract int` | ` `[interestOps](https://developer.android.com/reference/java/nio/channels/SelectionKey#interestOps())`() ` Retrieves this key's interest set. | | ` abstract `[SelectionKey](https://developer.android.com/reference/java/nio/channels/SelectionKey) | ` `[interestOps](https://developer.android.com/reference/java/nio/channels/SelectionKey#interestOps(int))`(int ops) ` Sets this key's interest set to the given value. | | ` int` | ` `[interestOpsAnd](https://developer.android.com/reference/java/nio/channels/SelectionKey#interestOpsAnd(int))`(int ops) ` Atomically sets this key's interest set to the bitwise intersection ("and") of the existing interest set and the given value. | | ` int` | ` `[interestOpsOr](https://developer.android.com/reference/java/nio/channels/SelectionKey#interestOpsOr(int))`(int ops) ` Atomically sets this key's interest set to the bitwise union ("or") of the existing interest set and the given value. | | ` final boolean` | ` `[isAcceptable](https://developer.android.com/reference/java/nio/channels/SelectionKey#isAcceptable())`() ` Tests whether this key's channel is ready to accept a new socket connection. | | ` final boolean` | ` `[isConnectable](https://developer.android.com/reference/java/nio/channels/SelectionKey#isConnectable())`() ` Tests whether this key's channel has either finished, or failed to finish, its socket-connection operation. | | ` final boolean` | ` `[isReadable](https://developer.android.com/reference/java/nio/channels/SelectionKey#isReadable())`() ` Tests whether this key's channel is ready for reading. | | ` abstract boolean` | ` `[isValid](https://developer.android.com/reference/java/nio/channels/SelectionKey#isValid())`() ` Tells whether or not this key is valid. | | ` final boolean` | ` `[isWritable](https://developer.android.com/reference/java/nio/channels/SelectionKey#isWritable())`() ` Tests whether this key's channel is ready for writing. | | ` abstract int` | ` `[readyOps](https://developer.android.com/reference/java/nio/channels/SelectionKey#readyOps())`() ` Retrieves this key's ready-operation set. | | ` abstract `[Selector](https://developer.android.com/reference/java/nio/channels/Selector) | ` `[selector](https://developer.android.com/reference/java/nio/channels/SelectionKey#selector())`() ` Returns the selector for which this key was created. | ||
| From class` `[java.lang.Object](https://developer.android.com/reference/java/lang/Object)` ` |--------------------------------------------------------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------| | ` `[Object](https://developer.android.com/reference/java/lang/Object) | ` `[clone](https://developer.android.com/reference/java/lang/Object#clone())`() ` Creates and returns a copy of this object. | | ` boolean` | ` `[equals](https://developer.android.com/reference/java/lang/Object#equals(java.lang.Object))`(`[Object](https://developer.android.com/reference/java/lang/Object)` obj) ` Indicates whether some other object is "equal to" this one. | | ` void` | ` `[finalize](https://developer.android.com/reference/java/lang/Object#finalize())`() ` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. | | ` final `[Class](https://developer.android.com/reference/java/lang/Class)`` | ` `[getClass](https://developer.android.com/reference/java/lang/Object#getClass())`() ` Returns the runtime class of this`Object`. | | ` int` | ` `[hashCode](https://developer.android.com/reference/java/lang/Object#hashCode())`() ` Returns a hash code value for the object. | | ` final void` | ` `[notify](https://developer.android.com/reference/java/lang/Object#notify())`() ` Wakes up a single thread that is waiting on this object's monitor. | | ` final void` | ` `[notifyAll](https://developer.android.com/reference/java/lang/Object#notifyAll())`() ` Wakes up all threads that are waiting on this object's monitor. | | ` `[String](https://developer.android.com/reference/java/lang/String) | ` `[toString](https://developer.android.com/reference/java/lang/Object#toString())`() ` Returns a string representation of the object. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long,%20int))`(long timeoutMillis, int nanos) ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait(long))`(long timeoutMillis) ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*, or until a certain amount of real time has elapsed. | | ` final void` | ` `[wait](https://developer.android.com/reference/java/lang/Object#wait())`() ` Causes the current thread to wait until it is awakened, typically by being*notified* or*interrupted*. | ||
## Protected constructors
### AbstractSelectionKey
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
protected AbstractSelectionKey ()
```
Initializes a new instance of this class.
## Public methods
### cancel
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public final void cancel ()
```
Cancels this key.
If this key has not yet been cancelled then it is added to its selector's cancelled-key set while synchronized on that set.
### isValid
Added in[API level 1](https://developer.android.com/guide/topics/manifest/uses-sdk-element#ApiLevels)
```
public final boolean isValid ()
```
Tells whether or not this key is valid.
A key is valid upon creation and remains so until it is cancelled, its channel is closed, or its selector is closed.
| Returns ||
|-----------|-------------------------------------------------|
| `boolean` | `true`if, and only if, this key is valid
|