import com.google.common.eventbus.Subscribe;
import vip.floatationdevice.guilded4j.G4JClient;
import vip.floatationdevice.guilded4j.event.ChatMessageCreatedEvent;
import vip.floatationdevice.guilded4j.object.ChatMessage;

public class Main {
  final static G4JClient client = new G4JClient("YOUR TOKEN HERE");

  @Subscribe
  public void onMessage(ChatMessageCreatedEvent event) {
    ChatMessage m = event.getChatMessage();
    if(m.getContent().equals("ping")) { // if someone sends "ping"
      client.getChatMessageManager()    // use the client's chat message manager
            .createChannelMessage(      // send a chat message
                m.getChannelId(),       // send to the channel where "ping" belongs to
                "pong"                  // send "pong"
            );
    }
  }

  public static void main(String[] args) {
    client.registerEventListener(new Main());
    client.connectWebSocket();
  }
}