In my scheduleAtFixedRate method, I put delay time to start run the method. But this delay time cannot work and run immediatly

问题

Here my code,

static ScheduledExecutorService scheduler = null;
scheduler.scheduleAtFixedRate(new Testing(),60, 24*60*60,TimeUnit.SECONDS);


public static Runnable Testing()
{ System.out.println("Testing...");
}

I want to call Runnable() method after 60 seconds later, but it call this method immediatly when i run the code. Is there any problem in my code. I'm new for scheduleAtFixedRate method. Thanks :)

回答1:

Please try this

scheduler.scheduleAtFixedRate(new Runnable() {
  @Override
  public void run() {
    System.out.println("Testing...");
  }
}, 60, 24*60*60,TimeUnit.SECONDS);

回答2:

Create a class that extends Runnable.

  static class MyRunnable implements Runnable {
    public void run() {
      System.out.println(i + " : Testing ... Current timestamp: " + new Date());
      // Put any relevant code here.
    }
  }

Then your code works as expected. Try running the full working code here at codiva.io online compiler ide.

A related suggestion, in professional code, people generally avoid using thread scheduler to run a task that runs daily. The most common option is to use cron job and a bit more setup. But that is out side the scope of this question.

回答3:

The Runnable is an interface and you must implement the run() method. You could try to change your code to

    scheduler.scheduleAtFixedRate(new Runnable() {
        @Override
        public void run() {
            System.out.println("Testing...");
        }
    },60, 24*60*60,TimeUnit.SECONDS);

来源：https://stackoverflow.com/questions/38431262/in-my-scheduleatfixedrate-method-i-put-delay-time-to-start-run-the-method-but