Class Event

innerclasses/controller/Event.java:9–23

import java.time.*; // Java 8 time classes

public abstract class Event {
  private Instant eventTime;
  protected final Duration delayTime;
  public Event(long millisecondDelay) {
    delayTime = Duration.ofMillis(millisecondDelay);
    start();
  }
  public void start() { // Allows restarting
    eventTime = Instant.now().plus(delayTime);
  }
  public boolean ready() {
    return Instant.now().isAfter(eventTime);
  }
  public abstract void action();
}