import com.hft.collections.*; public class HFTSystem { private static HFTHashMap<String, Double> priceMap; public static void main(String[] args) { priceMap = new HFTHashMap<>(); priceMap.put("AAPL", 134.56); priceMap.put("GOOG", 2456.78); double price = priceMap.get("AAPL"); priceMap.remove("AAPL"); boolean hasGOOG = priceMap.containsKey("GOOG"); } }