mega super kotlin inheritance

import org.telegram.telegrambots.bots.TelegramLongPollingBot;
import org.telegram.telegrambots.meta.api.interfaces.BotApiObject;
import org.telegram.telegrambots.meta.api.methods.BotApiMethod;
import org.telegram.telegrambots.meta.api.methods.send.SendMessage;
import org.telegram.telegrambots.meta.api.objects.Update;

class ScratchBot extends TelegramLongPollingBot {
    @Override public String getBotUsername() { return null; }
    @Override public String getBotToken() { return null; }

    private final Action handler = new UpdateHandler();

    @Override public void onUpdateReceived(Update update) {
        try {
            execute(handler.createExecutableForChat(update.getMessage().getChatId()));
        } catch (Exception ignored) {
        }
    }
}

interface Action {
    BotApiMethod<? extends BotApiObject> createExecutableForChat(long chatId);
}

class UpdateHandler implements Action {

    @Override
    public BotApiMethod<? extends BotApiObject> createExecutableForChat(long chatId) {
        return new SendMessage();
    }
}