Design Patterns and Best Practices in Java

Simple factory with class registration using reflection

For this method, we are going to use a map to keep the product IDs along with their corresponding classes:

private Map<String, Class> registeredProducts = new HashMap<String,Class>();

Then, we add a method to register new vehicles:

public void registerVehicle(String vehicleId, Class vehicleClass){  registeredProducts.put(vehicleId, vehicleClass);}

The create method becomes the following:

public Vehicle createVehicle(String type) throws InstantiationException, IllegalAccessException{  Class productClass = registeredProducts.get(type);  return (Vehicle)productClass.newInstance();}

In certain situations, working with reflection is either impossible or discouraged. Reflection requires a runtime ...