How to implement a scheduled task in Java?

There are multiple ways to implement scheduled tasks in Java, here are some common ways to do it:

1. A timer from the java.util package
2. Countdown clock
3. arrange an appointment

Timer timer = new Timer();
TimerTask task = new TimerTask() {
    public void run() {
        // 任务逻辑
    }
};
timer.schedule(task, delay, period);

The parameter delay indicates the initial time delay before executing the task, measured in milliseconds; while the parameter period indicates the interval time between task executions, also measured in milliseconds.

1. A service for scheduling tasks to be executed at specified times.
2. A service that schedules tasks to be executed at specified times.
3. arrange a time for something

ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
Runnable task = new Runnable() {
    public void run() {
        // 任务逻辑
    }
};
executor.schedule(task, delay, TimeUnit.MILLISECONDS);

The parameter delay indicates the amount of time before the task is initially executed, measured in milliseconds.

1. Automatically scheduled.
2. previously scheduled

@Scheduled(initialDelay = delay, fixedDelay = period)
public void task() {
    // 任务逻辑
}

The initialDelay parameter indicates the delay time before the first task execution, measured in milliseconds; while the fixedDelay parameter represents the interval time between task executions, also measured in milliseconds.

Here are several common ways to implement Java scheduled tasks, you can choose the appropriate method based on specific requirements.