import java.util.concurrent.*;
 
class Test {
 
  public static void main(String[] args) throws Throwable {
    ScheduledExecutorService executor = Executors.newSingleThreadScheduledExecutor();
    executor.scheduleAtFixedRate(() -> System.out.println("First"), 0, 99, TimeUnit.MILLISECONDS);
    Thread.sleep(500);
    executor.scheduleAtFixedRate(() -> System.out.println("Second"), 0, 99, TimeUnit.MILLISECONDS);
    Thread.sleep(1000);
    executor.shutdown();
  }
}
 

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