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Java Source Code / Java Documentation » Apache Harmony Java SE » java package » java.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   java.util.Timer

Timer
public class Timer (Code)
Timers are used to schedule jobs for execution in a background process. A single thread is used for the scheduling and this thread has the option of being a daemon thread. By calling cancel you can terminate a timer and it's associated thread. All tasks which are scheduled to run after this point are cancelled. Tasks are executed sequentially but are subject to the delays from other tasks run methods. If a specific task takes an excessive amount of time to run it may impact the time at which subsequent tasks may run.

The Timer task does not offer any guarantees about the real-time nature of scheduling tasks as it's underlying implementation relies on the Object.wait(long) method.

Multiple threads can share a single Timer without the need for their own synchronization.
See Also:   TimerTask
See Also:   java.lang.Object.wait(long)




Constructor Summary
public  Timer(boolean isDaemon)
     Creates a new Timer which may be specified to be run as a Daemon Thread.
public  Timer()
     Creates a new non-daemon Timer.
public  Timer(String name, boolean isDaemon)
    
public  Timer(String name)
    

Method Summary
public  voidcancel()
     Cancels the Timer and removed any scheduled tasks.
public  intpurge()
    
public  voidschedule(TimerTask task, Date when)
     Schedule a task for single execution.
public  voidschedule(TimerTask task, long delay)
     Schedule a task for single execution after a specific delay.
public  voidschedule(TimerTask task, long delay, long period)
     Schedule a task for repeated fix-delay execution after a specific delay.
public  voidschedule(TimerTask task, Date when, long period)
     Schedule a task for repeated fix-delay execution after a specific time has been reached.
public  voidscheduleAtFixedRate(TimerTask task, long delay, long period)
     Schedule a task for repeated fixed-rate execution after a specific delay has been happened.
public  voidscheduleAtFixedRate(TimerTask task, Date when, long period)
     Schedule a task for repeated fixed-rate execution after a specific time has been reached.


Constructor Detail
Timer
public Timer(boolean isDaemon)(Code)
Creates a new Timer which may be specified to be run as a Daemon Thread.
Parameters:
  isDaemon - true if Timers thread should be a daemon thread.



Timer
public Timer()(Code)
Creates a new non-daemon Timer.



Timer
public Timer(String name, boolean isDaemon)(Code)



Timer
public Timer(String name)(Code)




Method Detail
cancel
public void cancel()(Code)
Cancels the Timer and removed any scheduled tasks. If there is a currently running task it is not effected. No more tasks may be scheduled on this Timer. Subsequent calls do nothing.



purge
public int purge()(Code)



schedule
public void schedule(TimerTask task, Date when)(Code)
Schedule a task for single execution. If when is less than the current time, it will be scheduled to executed as soon as possible.
Parameters:
  task - The task to schedule
Parameters:
  when - Time of execution
exception:
  IllegalArgumentException - if when.getTime() < 0
exception:
  IllegalStateException - if the timer has been cancelled, the task has beenscheduled or cancelled.



schedule
public void schedule(TimerTask task, long delay)(Code)
Schedule a task for single execution after a specific delay.
Parameters:
  task - The task to schedule
Parameters:
  delay - Amount of time before execution
exception:
  IllegalArgumentException - if delay < 0
exception:
  IllegalStateException - if the timer has been cancelled, the task has beenscheduled or cancelled.



schedule
public void schedule(TimerTask task, long delay, long period)(Code)
Schedule a task for repeated fix-delay execution after a specific delay.
Parameters:
  task - The task to schedule
Parameters:
  delay - Amount of time before first execution
Parameters:
  period - Amount of time between subsequent executions
exception:
  IllegalArgumentException - if delay < 0 or period < 0
exception:
  IllegalStateException - if the timer has been cancelled, the task has beenscheduled or cancelled.



schedule
public void schedule(TimerTask task, Date when, long period)(Code)
Schedule a task for repeated fix-delay execution after a specific time has been reached.
Parameters:
  task - The task to schedule
Parameters:
  when - Time of first execution
Parameters:
  period - Amount of time between subsequent executions
exception:
  IllegalArgumentException - if when.getTime() < 0 or period < 0
exception:
  IllegalStateException - if the timer has been cancelled, the task has beenscheduled or cancelled.



scheduleAtFixedRate
public void scheduleAtFixedRate(TimerTask task, long delay, long period)(Code)
Schedule a task for repeated fixed-rate execution after a specific delay has been happened. The difference of fixed-rate is that it may bunch up subsequent task runs to try to get the task repeating at it's desired time.
Parameters:
  task - The task to schedule
Parameters:
  delay - Amount of time before first execution
Parameters:
  period - Amount of time between subsequent executions
exception:
  IllegalArgumentException - if delay < 0 or period < 0
exception:
  IllegalStateException - if the timer has been cancelled, the task has beenscheduled or cancelled.



scheduleAtFixedRate
public void scheduleAtFixedRate(TimerTask task, Date when, long period)(Code)
Schedule a task for repeated fixed-rate execution after a specific time has been reached. The difference of fixed-rate is that it may bunch up subsequent task runs to try to get the task repeating at it's desired time.
Parameters:
  task - The task to schedule
Parameters:
  when - Time of first execution
Parameters:
  period - Amount of time between subsequent executions
exception:
  IllegalArgumentException - if when.getTime() < 0 or period < 0
exception:
  IllegalStateException - if the timer has been cancelled, the task has beenscheduled or cancelled.



Methods inherited from java.lang.Object
protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object object)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final public Class<? extends Object> getClass()(Code)(Java Doc)
public int hashCode()(Code)(Java Doc)
final public void notify()(Code)(Java Doc)
final public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final public void wait(long millis, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait(long millis) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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