| FastDateFormat | Fast date formatter that caches recently formatted date information and uses it to avoid too-frequent calls to the underlying formatter. | code | html |
| Queue | A simple FIFO queue class which causes the calling thread to wait if the queue is empty and notifies threads that are waiting when it is not empty. | code | html |
| SimplePool | Simple object pool. | code | html |
| SystemLogHandler | This helper class may be used to do sophisticated redirection of System.out and System.err. | code | html |