# ThreadPoolExecutor.DiscardOldestPolicy

public static class **ThreadPoolExecutor.DiscardOldestPolicy** extends [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)  
implements [RejectedExecutionHandler](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/RejectedExecutionHandler.html) A handler for rejected tasks that discards the oldest unhandled
request and then retries `execute`, unless the executor
is shut down, in which case the task is discarded.

### Public Constructor Summary

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|   | [DiscardOldestPolicy](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.DiscardOldestPolicy.html#DiscardOldestPolicy())() Creates a `DiscardOldestPolicy` for the given executor. |

### Public Method Summary

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| void | [rejectedExecution](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.DiscardOldestPolicy.html#rejectedExecution(java.lang.Runnable,%20java.util.concurrent.ThreadPoolExecutor))([Runnable](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Runnable.html) r, [ThreadPoolExecutor](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.html) e) Obtains and ignores the next task that the executor would otherwise execute, if one is immediately available, and then retries execution of task r, unless the executor is shut down, in which case task r is instead discarded. |

### Inherited Method Summary

From class [java.lang.Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html)

|---|---|
| [Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) | [clone](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#clone())() Creates and returns a copy of this `Object`. |
| boolean | [equals](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#equals(java.lang.Object))([Object](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html) obj) Compares this instance with the specified object and indicates if they are equal. |
| void | [finalize](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#finalize())() Invoked when the garbage collector has detected that this instance is no longer reachable. |
| final [Class](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html)\<?\> | [getClass](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#getClass())() Returns the unique instance of `https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Class.html` that represents this object's class. |
| int | [hashCode](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#hashCode())() Returns an integer hash code for this object. |
| final void | [notify](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notify())() Causes a thread which is waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| final void | [notifyAll](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#notifyAll())() Causes all threads which are waiting on this object's monitor (by means of calling one of the `wait()` methods) to be woken up. |
| [String](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/String.html) | [toString](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#toString())() Returns a string containing a concise, human-readable description of this object. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long,%20int))(long timeout, int nanos) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait(long))(long timeout) Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object or until the specified timeout expires. |
| final void | [wait](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Object.html#wait())() Causes the calling thread to wait until another thread calls the `notify()` or `notifyAll()` method of this object. |

From interface [java.util.concurrent.RejectedExecutionHandler](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/RejectedExecutionHandler.html)

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| abstract void | [rejectedExecution](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/RejectedExecutionHandler.html#rejectedExecution(java.lang.Runnable,%20java.util.concurrent.ThreadPoolExecutor))([Runnable](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Runnable.html) r, [ThreadPoolExecutor](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.html) executor) Method that may be invoked by a `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.html` when `https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.html#execute(java.lang.Runnable)` cannot accept a task. |

## Public Constructors

#### public
**DiscardOldestPolicy**
()

Creates a `DiscardOldestPolicy` for the given executor.

## Public Methods

#### public void
**rejectedExecution**
([Runnable](https://developers.google.com/j2objc/javadoc/jre/reference/java/lang/Runnable.html) r, [ThreadPoolExecutor](https://developers.google.com/j2objc/javadoc/jre/reference/java/util/concurrent/ThreadPoolExecutor.html) e)

Obtains and ignores the next task that the executor
would otherwise execute, if one is immediately available,
and then retries execution of task r, unless the executor
is shut down, in which case task r is instead discarded.

##### Parameters

| r | the runnable task requested to be executed |
| e | the executor attempting to execute this task |
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