每10分钟调用一次函数

Question

我不是专家，只是初学者。所以我恳请你为我写一些代码。

如果我有两个类，CLASS A和CLASS B，并且在CLASS B内部有一个名为funb()的函数。我想每隔十分钟从CLASS A调用这个函数。

你已经给了我一些想法，但我不太明白。

你能发布一些示例代码吗？

Answer 1

看看ScheduledExecutorService：

这是一个带有方法的类，该方法将ScheduledExecutorService设置为每隔十秒钟发出一小时的哔声：

 import static java.util.concurrent.TimeUnit.*;
 class BeeperControl {
    private final ScheduledExecutorService scheduler =
       Executors.newScheduledThreadPool(1);

    public void beepForAnHour() {
        final Runnable beeper = new Runnable() {
                public void run() { System.out.println("beep"); }
            };
        final ScheduledFuture<?> beeperHandle =
            scheduler.scheduleAtFixedRate(beeper, 10, 10, SECONDS);
        scheduler.schedule(new Runnable() {
                public void run() { beeperHandle.cancel(true); }
            }, 60 * 60, SECONDS);
    }
 }

Answer 2

import java.util.Date;

import java.util.Timer;

import java.util.TimerTask;

public class ClassExecutingTask {

    long delay = 10 * 1000; // delay in milliseconds
    LoopTask task = new LoopTask();
    Timer timer = new Timer("TaskName");

    public void start() {
        timer.cancel();
        timer = new Timer("TaskName");
        Date executionDate = new Date(); // no params = now
        timer.scheduleAtFixedRate(task, executionDate, delay);
    }

    private class LoopTask extends TimerTask {
        public void run() {
            System.out.println("This message will print every 10 seconds.");
        }
    }

    public static void main(String[] args) {
        ClassExecutingTask executingTask = new ClassExecutingTask();
        executingTask.start();
    }


}

Answer 3

试试这个。它会在每个分钟内重复run（）函数。要更改设置分钟，请更改MINUTES变量

int MINUTES = 10; // The delay in minutes
Timer timer = new Timer();
 timer.schedule(new TimerTask() {
    @Override
    public void run() { // Function runs every MINUTES minutes.
        // Run the code you want here
        CLASSB.funcb(); // If the function you wanted was static
    }
 }, 0, 1000 * 60 * MINUTES);
    // 1000 milliseconds in a second * 60 per minute * the MINUTES variable. 

别忘了做进口！

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

有关更多信息，请转到此处：

http://docs.oracle.com/javase/7/docs/api/java/util/Timer.html http://docs.oracle.com/javase/7/docs/api/java/util/TimerTask.html

Answer 4

public class datetime {

    public String CurrentDate() {

        java.util.Date dt = new java.util.Date();
        java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("yyyy-MM-dd HH:mm:ss"); 
        String currentTime = sdf.format(dt);
        return currentTime;

    }

    public static void main(String[] args) {
        class SayHello extends TimerTask {

            datetime thisObj = new datetime();

            public void run() {
                String todaysdate = thisObj.CurrentDate();
                System.out.println(todaysdate);
            }
        }
        Timer timer = new Timer();
        timer.schedule(new SayHello(), 0, 5000); 
    }
}

Answer 5

Java 8的解决方案

ClassB b = new ClassB();    
ScheduledExecutorService executor = Executors.newScheduledThreadPool(1);
Runnable task = () -> {
    b.funb();
};
executor.scheduleWithFixedDelay(task, 0, 10, TimeUnit.MINUTES);