task3.java

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

public class Task3 {

  public static void main(String[] args) {
    
    Runnable runnable = new Runnable() {
      public void run() {
        // task to run goes here
        System.out.println("Hello !!");
      }
    };
    
    ScheduledExecutorService service = Executors
                    .newSingleThreadScheduledExecutor();
    service.scheduleAtFixedRate(runnable, 0, 1, TimeUnit.SECONDS);
  }
}