Chapter 14: Problem 32

How are the time intervals between a Timer object’s action events measured?

Short Answer

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Answer: Time intervals between action events are measured using Timer objects by specifying the period argument when scheduling the TimerTask with the schedule() method. For example, if we call schedule(task, 0, 1000), the task will be executed immediately (as the delay is 0), and then it will be executed every 1000 milliseconds (1 second) thereafter. The Timer object will handle the timing and repeatedly execute the run() method of the TimerTask at the specified interval.

Step by step solution

Understanding Timer Objects

A Timer object is an instance of the java.util.Timer class, which provides a facility for scheduling tasks for future execution at fixed intervals of time. This class is primarily used for performing background tasks (e.g., updating the user interface) at regular intervals. The Timer class has several methods to schedule tasks for future execution, such as schedule(), scheduleAtFixedRate(), and so on. Here we will focus on understanding how time intervals between action events are measured.

Creating a TimerTask

A Timer object requires a TimerTask to perform the desired action. TimerTask is an abstract class that implements Runnable, and we need to subclass it to create our custom task. We do this by overriding the run() method, which contains the code to be executed at each action event.

Scheduling the TimerTask

Once we have created a TimerTask object, we can schedule it for execution by calling the method schedule(). This method has several overloads, including schedule(TimerTask task, long delay) and schedule(TimerTask task, long delay, long period). The first version schedules the task for execution after the specified delay (in milliseconds). The second version schedules the task for repeated fixed-rate execution, beginning after the specified delay, and subsequent executions happening every period (also in milliseconds).

Measuring Time Intervals

The time intervals between action events are measured by specifying the period argument when scheduling the TimerTask with the schedule() method. For instance, if we call schedule(task, 0, 1000), the task will be executed immediately (as the delay is 0), and then it will be executed every 1000 milliseconds (1 second) thereafter. The Timer object will handle the timing and repeatedly execute the run() method of the TimerTask at the specified interval.

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How are the time intervals between a Timer object’s action events measured?

Short Answer

Step by step solution

Understanding Timer Objects

Creating a TimerTask

Scheduling the TimerTask

Measuring Time Intervals

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