IT. Expert System.

Direct Known Subclasses:

FinalizerReference, PhantomReference, SoftReference, WeakReference

public abstract class Reference<T>
extends Object

• Field Summary

  Fields

  Modifier and Type	Field and Description
  Reference<?>	pendingNext Used internally by the VM.

• Method Summary

  Methods

  Modifier and Type	Method and Description
  void	clear() Makes the referent null.
  boolean	enqueue() Forces the reference object to be enqueued if it has been associated with a queue.
  boolean	enqueueInternal() Adds an object to its reference queue.
  T	get() Returns the referent of the reference object.
  boolean	isEnqueued() Checks whether the reference object has been enqueued.

  • Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• Field Detail

  • pendingNext

    public volatile Reference<?> pendingNext

    Used internally by the VM. This field forms a circular and singly linked list of reference objects discovered by the garbage collector and awaiting processing by the reference queue thread.

• Method Detail

  • clear

    public void clear()

    Makes the referent null. This does not force the reference object to be enqueued.

  • enqueueInternal

    public final boolean enqueueInternal()

    Adds an object to its reference queue.

    Returns:

    true if this call has caused the Reference to become enqueued, or false otherwise

  • enqueue

    public boolean enqueue()

    Forces the reference object to be enqueued if it has been associated with a queue.

    Returns:

    true if this call has caused the Reference to become enqueued, or false otherwise

  • get

    public T get()

    Returns the referent of the reference object.

    Returns:

    the referent to which reference refers, or null if the object has been cleared.

  • isEnqueued

    public boolean isEnqueued()

    Checks whether the reference object has been enqueued.

    Returns:

    true if the Reference has been enqueued, false otherwise