Dependency Injection - Code Illustration Using Java

Code Illustration Using Java

Using the stock trading example mentioned above, the following Java examples show how coupled (manually injected) dependencies and framework-injected dependencies are typically staged.

The following interface contracts define the behavior of components in the sample system.

public interface IOnlineBrokerageService { String getStockSymbols; double getAskingPrice(String stockSymbol); double getOfferPrice(String stockSymbol); void putBuyOrder(String stockSymbol, int shares, double bidPrice); void putSellOrder(String stockSymbol, int shares, double offerPrice); } public interface IStockAnalysisService { double getEstimatedValue(String stockSymbol); } public interface IAutomatedStockTrader { void executeTrades; }