| java.lang.Object
 java.lang.ref.Reference
| Reference | | abstract public class Reference (Code) | | Abstract base class for reference objects. This class defines the
operations common to all reference objects. Because reference objects are
implemented in close cooperation with the garbage collector, this class may
not be subclassed directly.
version:
1.49, 05/05/07
author:
Mark Reinhold
since:
1.2 |
| Method Summary | |
| public void | clear()
Clears this reference object. | | public boolean | enqueue()
Adds this reference object to the queue with which it is registered,
if any. | | public T | get()
Returns this reference object's referent. | | public boolean | isEnqueued()
Tells whether or not this reference object has been enqueued, either by
the program or by the garbage collector. If this reference object was
not registered with a queue when it was created, then this method will
always return false. |
| Reference | | Reference(T referent)(Code) | | |
| clear | | public void clear()(Code) | | Clears this reference object. Invoking this method will not cause this
object to be enqueued.
This method is invoked only by Java code; when the garbage collector
clears references it does so directly, without invoking this method.
|
| enqueue | | public boolean enqueue()(Code) | | Adds this reference object to the queue with which it is registered,
if any.
This method is invoked only by Java code; when the garbage collector
enqueues references it does so directly, without invoking this method.
true if this reference object was successfullyenqueued; false if it was already enqueued or ifit was not registered with a queue when it was created |
| get | | public T get()(Code) | | Returns this reference object's referent. If this reference object has
been cleared, either by the program or by the garbage collector, then
this method returns null.
The object to which this reference refers, ornull if this reference object has been cleared |
| isEnqueued | | public boolean isEnqueued()(Code) | | Tells whether or not this reference object has been enqueued, either by
the program or by the garbage collector. If this reference object was
not registered with a queue when it was created, then this method will
always return false.
true if and only if this reference object hasbeen enqueued |
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