Java Module java.base Package java.lang.ref Class ReferenceQueue<T>（JDK11）

Constructor Detail

• ReferenceQueue

  public ReferenceQueue()

  Constructs a new reference-object queue.

Method Detail

• poll

  public Reference<? extends T> poll()

  Polls this queue to see if a reference object is available. If one is available without further delay then it is removed from the queue and returned. Otherwise this method immediately returns null.

  Returns:

  A reference object, if one was immediately available, otherwise null

• remove

  public Reference<? extends T> remove​(long timeout)
                                throws IllegalArgumentException,
                                       InterruptedException

  Removes the next reference object in this queue, blocking until either one becomes available or the given timeout period expires.

  This method does not offer real-time guarantees: It schedules the timeout as if by invoking the Object.wait(long) method.

  Parameters:

  timeout - If positive, block for up to timeout milliseconds while waiting for a reference to be added to this queue. If zero, block indefinitely.

  Returns:

  A reference object, if one was available within the specified timeout period, otherwise null

  Throws:

  IllegalArgumentException - If the value of the timeout argument is negative

  InterruptedException - If the timeout wait is interrupted

• remove

  public Reference<? extends T> remove()
                                throws InterruptedException

  Removes the next reference object in this queue, blocking until one becomes available.

  Returns:

  A reference object, blocking until one becomes available

  Throws:

  InterruptedException - If the wait is interrupted