Strategy Pattern in Java

For this demo of the strategy pattern, we'll take the role of an up-and-coming trading firm looking to implement some algorithmic trading. To us, it's very important that we tune our trading strategy to the current market conditions in order to make the biggest profit in bull markets, while losing as little money as possible during bear markets.

   public interface TradingStrategy
   {
   void MakeTrades();
   }

   public class RiskyTradingStrategy implements TradingStrategy
   {
   public void MakeTrades()
   {
       System.out.println("Making risky trades!");
   }
   }

   public class ModerateTradingStrategy implements TradingStrategy
   {
   public void MakeTrades()
   {
       System.out.println("Making moderate trades.");
   }
   }

   public class ConservativeTradingStrategy implements TradingStrategy
   {
   public void MakeTrades()
   {
       System.out.println("Making safe trades.");
   }
   }

   //Important for getting the current state of the market:
   public enum TradeConditions 
   {
   BearMarket,
   BullMarket,
   RecoveringMarket
   }

   public class TradingFirm
   {
   // Squirrel away the strategies to conserve GC:
   private TradingStrategy riskyStrategy;
   private TradingStrategy moderateStrategy;
   private TradingStrategy safeStrategy;

   // The currently used strategy:
   private TradingStrategy currentStrategy;

   public TradingFirm()
   {
       riskyStrategy = new RiskyTradingStrategy();
       moderateStrategy = new ModerateTradingStrategy();
       safeStrategy = new ConservativeTradingStrategy();

       currentStrategy = moderateStrategy;
   }

   public void MarketUpdate(TradeConditions marketCondition)
   {
       // Select the best strategy based on the market conditions:
       switch (marketCondition) {
           case BearMarket:
               currentStrategy = safeStrategy;
               break;
           case BullMarket:
               currentStrategy = riskyStrategy;
               break;
           case RecoveringMarket:
               currentStrategy = moderateStrategy;
               break;
           default:
               break;
       }

       // Make trades with that strategy:
       currentStrategy.MakeTrades();
   }

   }