java 计时器

import java.util.Timer;
import java.util.TimerTask;

public class TimerExample {
    public static void main(String[] args) {
        Timer timer = new Timer();
        TimerTask task = new TimerTask() {
            @Override
            public void run() {
                System.out.println("Task executed at: " + new Date());
            }
        };
        // Schedule the task to run once after 5 seconds
        timer.schedule(task, 5000);
    }
}

import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;

public class ScheduledExecutorExample {
    public static void main(String[] args) {
        ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
        Runnable task = () -> System.out.println("Task executed at: " + new Date());
        // Schedule the task to run every 2 seconds, starting after an initial delay of 1 second
        executor.scheduleAtFixedRate(task, 1, 2, TimeUnit.SECONDS);
    }
}