Introduction and use cases of ScheduledExecutorService in Java (recommended)

Updated: October 24, 2024 11:41:07 Author: Count Wang

ScheduledExecutorService is an interface in Java concurrency package. It is used to schedule tasks to run or execute regularly after a given delay. It inherits from ExecutorService. It has thread pool characteristics and can reuse threads to improve efficiency. This article mainly introduces ScheduledExecutorService in Java and uses cases. Interested friends can take a look.

ScheduledExecutorServiceIt is Java concurrent packagean interface in which provides a mechanism that allows us to schedule a task to run after a given delay, or execute it regularly.

Main features

Single schedule: The task can be scheduled to be executed once after a certain delay.
Periodic Scheduling: The tasks can be arranged to be repeated for a certain period of time.
Thread pool：ScheduledExecutorServiceImplementedExecutorServiceInterface, so it has the characteristics of a thread pool, can reuse threads and improve efficiency.
Flexible scheduling strategy: The execution time of tasks can be flexibly controlled.

Use Cases

1. Single schedule

import .*;
public class SingleScheduleExample {
    public static void main(String[] args) {
        ScheduledExecutorService scheduler = (1);
        (() -&gt; {
            ("Task executed");
        }, 5, ); // Execute after 5 seconds        ();
    }
}

2. Periodic Scheduling

import .*;
public class PeriodicScheduleExample {
    public static void main(String[] args) {
        ScheduledExecutorService scheduler = (1);
        Runnable task = () -&gt; {
            ("Recurring tasks are executed");
        };
        (task, 1, 3, ); // Initial delay of 1 second, then every 3 seconds        // If necessary, stop after a certain number of times        (() -&gt; (), 10, );
    }
}

3. Fixed delay scheduling

import .*;
public class FixedDelayScheduleExample {
    public static void main(String[] args) {
        ScheduledExecutorService scheduler = (1);
        Runnable task = () -&gt; {
            ("Fixed delay task executed");
        };
        (task, 1, 3, ); // The initial delay is 1 second, and then wait for 3 seconds after each task is executed before executing the next time.        // If necessary, stop after a certain number of times        (() -&gt; (), 10, );
    }
}

Things to note

Resource Management:useScheduledExecutorServiceWhen resources need to be managed correctly, such as calling them when they are no longer neededshutdown()orshutdownNow()Method to close the thread pool.
Exception handling: Exceptions thrown in the task will not affect the execution of other tasks, but if not processed, it may cause the task to terminate.
Thread safety: Submit toScheduledExecutorServiceThe tasks should be thread-safe, or the synchronization should be handled correctly within the task.

ScheduledExecutorServiceIt is a very powerful tool that can help us handle tasks that need to be executed regularly or periodically, and it also provides thread pool optimization to make resource utilization more efficient.

This is the article about the introduction and use cases of ScheduledExecutorService in Java. For more related content on using ScheduledExecutorService, please search for my previous articles or continue browsing the related articles below. I hope everyone will support me in the future!

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