Java中ScheduledExecutorService介绍和使用案例(推荐)

import java.util.concurrent.*;
public class SingleScheduleExample {
    public static void main(String[] args) {
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
        scheduler.schedule(() -> {
            System.out.println("任务执行了");
        }, 5, TimeUnit.SECONDS); // 5秒后执行
        scheduler.shutdown();
    }
}

import java.util.concurrent.*;
public class PeriodicScheduleExample {
    public static void main(String[] args) {
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
        Runnable task = () -> {
            System.out.println("周期性任务执行了");
        };
        scheduler.scheduleAtFixedRate(task, 1, 3, TimeUnit.SECONDS); // 初始延迟1秒，之后每3秒执行一次
        // 如果需要在一定次数后停止
        scheduler.schedule(() -> scheduler.shutdown(), 10, TimeUnit.SECONDS);
    }
}

import java.util.concurrent.*;
public class FixedDelayScheduleExample {
    public static void main(String[] args) {
        ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1);
        Runnable task = () -> {
            System.out.println("固定延迟任务执行了");
        };
        scheduler.scheduleWithFixedDelay(task, 1, 3, TimeUnit.SECONDS); // 初始延迟1秒，之后每次执行完任务后等待3秒再执行下一次
        // 如果需要在一定次数后停止
        scheduler.schedule(() -> scheduler.shutdown(), 10, TimeUnit.SECONDS);
    }
}