| Queue |
interface |
Basic queue interface. Defines the basic methods to add elements to the
queue (offer, add), look
at the head of the queue (peek, element)
or pop the head of the queue off the queue (poll, remove).
There are two versions of each method, e.g. offer
returns a magic value on trouble, and add throws an Exception.
Queue is derived from Collection
so all the Collection methods are also available. |
| BlockingQueue |
interface |
If the queue is empty, blocks the current thread until some other thread
adds an element. You can provide a timeout how long you are prepared to wait. |
| AbstractQueue |
abstract class |
Underpinnings for ArrayBlockingQueue, ConcurrentLinkedQueue,
DelayQueue, LinkedBlockingQueue,
PriorityBlockingQueue, PriorityQueue,
SynchronousQueue. |
| ArrayBlockingQueue |
class |
FIFO blocking queue where the elements are stored in an fixed size array.
The array buffer is circular, somtimes called a squirrel cage buffer or hamster
buffer. When the array fills up it wraps around to the beginning being careful
not to overwrite existing elements. If all goes well, the oldest elements are
popped off in time to create room for new elements, hot on their heels. |
| ConcurrentLinkedQueue |
class |
Unbounded (can grow arbitrarily large), FIFO, thread-safe queue. |
| DelayQueue |
class |
Unbounded, sorted by delay, so that elements can be eligible to leave the
queue once the delay has expired. The oldest expired delay element pops from the
queue first. |
| Executors |
class |
creates thread pools that work off a todo queue. |
| LinkedBlockingQueue |
class |
Optionally bounded, FIFO blocking queue implemented with linked nodes. |
| LinkedList |
class |
Supports List interface, though it is very slow at indexing since it is
implemented as linked nodes. |
| PriorityBlockingQueue |
class |
Blocking, sorted queue ordered by natural order Comparable
interface or supplied Comparator. Does not permit
null elements. Pops the smallest element. |
| PriorityQueue |
class |
Non-blocking, sorted queue ordered by natural order Comparable
interface or supplied Comparator. Does not permit
null elements. Pops the smallest element. |
| SynchronousQueue |
class |
A dummy queue that can’t even hold one element. Every add to the queue
must be matched by an immediate pop before there can be another add. It is for
thread to thread handoff. |
| ThreadPoolExecutor |
class |
executes each submitted task using one of possibly several pooled threads. |
Please email your feedback for publication, errors, omissions, typos, formatting errors, ambiguities, unclear wording, broken/redirected link reports, suggestions to improve this page or comments to
Roedy Green :
