ScheduledExecutorService 仅运行一次

使用ScheduledExecutorService可以在Java中实现定时任务的调度，它是ExecutorService的一个子接口。ScheduledExecutorService提供了一系列的方法来支持任务的周期性执行、延迟执行以及只运行一次的执行。

java
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class ScheduledTaskExample {
    public static void main(String[] args) {
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        Runnable task = () -> {
            System.out.println("定时任务执行中...");
            // 任务的具体逻辑代码
        };
        // 延迟1秒后开始执行任务，每隔5秒再次执行
        executorService.scheduleAtFixedRate(task, 1, 5, TimeUnit.SECONDS);
    }
}

java
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class DelayedTaskExample {
    public static void main(String[] args) {
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        Runnable task = () -> {
            System.out.println("延迟任务执行中...");
            // 任务的具体逻辑代码
        };
        // 延迟3秒后执行任务
        executorService.schedule(task, 3, TimeUnit.SECONDS);
    }
}

java
import java.util.concurrent.Executors;
import java.util.concurrent.ScheduledExecutorService;
import java.util.concurrent.TimeUnit;
public class OneTimeTaskExample {
    public static void main(String[] args) {
        ScheduledExecutorService executorService = Executors.newSingleThreadScheduledExecutor();
        Runnable task = () -> {
            System.out.println("仅运行一次的任务执行中...");
            // 任务的具体逻辑代码
        };
        // 延迟2秒后执行任务，仅运行一次
        executorService.schedule(task, 2, TimeUnit.SECONDS);
    }
}