zkWatcherImpl.java

public class WatcherImpl implements Watcher{
  @Override 
  public void process(WatchedEvent event) {
    if(event.getType() == Event.EventType.NodeDataChanged) {
      System.out.println("The Data has changed"); 
    } 
    else if(event.getType() == Event.EventType.NodeChildrenChanged){
      System.out.println("Children have changed"); 
    }
  }
}