AutomaticDripCoffeeMaker.java

public class AutomaticDripCoffeeMaker extends BaseCoffeeMaker {
    
    public AutomaticDropCoffeeMaker() {
        super();
    }
    
    public void scheduleBrew() {
        // schedules a call to #brew()
    }
    
}

BaseCoffeeMaker.java

/**
 * Base class for a coffee maker.
 */
public class BaseCoffeeMaker {
    
    public Heater heater;
    public Pump pump;
    
    public BaseCoffeeMaker() {
        heater = new ElectricHeater();
        pump = new ThermosiphonPump();
    }
    
    public Heater getHeater() {
        return heater;
    }
    
    public Pump getPump() {
        return pump;
    }
    
    public void brew() {
        if (heater.isAtBrewTemp()) {
            //brew
        }
    }
    
}

CoffeeShop.java

public class CoffeeShop {
    
    public static void main(String[] args) {
        
        String coffeeType = args[0];
        BaseCoffeeMaker coffeMaker = null;
        if (coffeeType.equals("drip")) {
            coffeeMaker = new AutomaticDripCoffeeMaker();
        } else if (coffeeType.equals("pourOver")) {
            coffeeMaker = new PorcelainPourOverCoffeeMaker();
        }
        
        coffeeMaker.brew();
    }
    
}

PorcelainPourOverCoffeeMaker.java

public class PorcelainPourOverCoffeeMaker extends BaseCoffeeMaker {
    
    public PorcelainPourOverCoffeeMaker() {
        super();
        heater = null;
        pump = null;
    }
    
}