Java.util.Timer Class
Java Timer Class
Java.util package has a Timer class which provides a facility for threads to schedule tasks for future execution in a background thread. Tasks may be scheduled for one-time execution, or for repeated execution at regular intervals. It is thread-safe class, i.e, multiple threads can share a single Timer object without the need for external synchronization. Internally, it uses a binary heap to represent its task queue, so the cost to schedule a task is O(log n), where n is the number of concurrently scheduled tasks.
Class declaration
The declaration of java.util.Timer class is:
public class Timer extends Object
Class Constructors
| S.N | Constructors & Description |
|---|---|
| 1. |
Timer() Creates a new timer. |
| 2. |
Timer(boolean isDaemon) Creates a new timer whose associated thread may be specified to run as a daemon. |
| 3. |
Timer(String name) Creates a new timer whose associated thread has the specified name. |
| 4. |
Timer(String name, boolean isDaemon) Creates a new timer whose associated thread has the specified name, and may be specified to run as a daemon. |
java.util.Timer Methods
The java.util.Timer class has a number of methods which are listed below:
Member Methods
| S.N | Methods & Description |
|---|---|
| 1. |
void cancel() Terminates the timer, discarding any currently scheduled tasks. |
| 2. |
int purge() Removes all cancelled tasks from this timer's task queue. |
| 3. |
void schedule(TimerTask task, Date time) Schedules the specified task for execution at the specified time. |
| 4. |
void schedule(TimerTask task, Date firstTime, long period) Schedules the specified task for repeated fixed-delay execution, beginning at the specified time. |
| 5. |
void schedule(TimerTask task, long delay) Schedules the specified task for execution after the specified delay. |
| 6. |
void schedule(TimerTask task, long delay, long period) Schedules the specified task for repeated fixed-delay execution, beginning after the specified delay. |
| 7. |
void scheduleAtFixedRate(TimerTask task, Date firstTime, long period) Schedules the specified task for repeated fixed-rate execution, beginning at the specified time. |
| 8. |
void scheduleAtFixedRate(TimerTask task, long delay, long period) Schedules the specified task for repeated fixed-rate execution, beginning after the specified delay. |
Methods inherited
This class inherits the methods of following class:
- java.lang.Object
