Schedule Timer Tasks

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Schedule Timer Tasks

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#1 by (3 votes)

2

Situation:

Description: I have this Timer to perform my tasks in a given time period according to the% informed%.

Problem: When running the program the tasks start ignoring the seconds informed, after the task is executed for the first time the time is respected.

Need: When the program starts it should wait for the seconds you enter "30", "60", "1200" and then the task should begin.

    public executarTarefas(int seconds) {
            timer = new Timer();
            timer.schedule(new limparQuarto(), Calendar.getInstance().getTime(), seconds * 1000);   
}

Note: This method executes the seconds task, which is just an example, if someone knows how to reach "need" disgrace.

java

asked by anonymous 21.02.2014 / 17:22

1 answer

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score 3 · Accepted Answer

The second parameter of schedule refers to the first execution, so it should be the period entered plus the sum of the desired seconds, according to the reference below:

link

public void schedule(TimerTask task,
            Date firstTime,
            long period)

Schedules the specified task for repeated fixed-delay execution, beginning at the specified time. Subsequent   take place at approximately regular intervals, separated by   the specified period.

In fixed-delay execution, each execution is   scheduled relative to the actual execution time of the previous   execution. If an execution is delayed for any reason (such as garbage   collection or other background activity), subsequent executions will   be delayed as well. In the long run, the frequency of execution will   generally be slightly lower than the reciprocal of the specified   period (assuming the underlying system clock Object.wait (long) is   accurate). As a consequence of the above, if the first time scheduled   is in the past, it is scheduled for immediate execution.

Fixed-delay execution is appropriate for recurring activities that   require "smoothness." In other words, it is appropriate for activities   where is it more important to keep the frequency accurate in the short   run than in the long run. This includes most animation tasks, such as   blinking to cursor at regular intervals. It also includes tasks wherein   regular activity is performed in response to human input, such as   automatically repeating a character as long as a key is held down.

Parameters:

task-task to be scheduled.

firstTime - First time to which task is executed.

period-time in milliseconds between successive task executions.

Throws: IllegalArgumentException - if firstTime.getTime () < 0, or period

21.02.2014 / 17:31