Decorator Pattern: How to create the final object based on just user input?

I started learning the decorator pattern and it is the first time that i am faced with this kind of problem.

What bothers me is this line:

Drink drinkObject = new ChocolateDecorator(new SoyDecorator(new Espresso())); 

Let's say i make a simple interface for the user to select the ingredients. How can i declare the object at runtime based on user input only?

Example: the user selects two "Soy" then the object should be:

Drink drinkObject = new SoyDecorator(new SoyDecorator(new Espresso())); 

public class main {

    public static void main(String[] args) {

        Drink drinkObject = new ChocolateDecorator(new SoyDecorator(new Espresso())); 
        System.out.println("Order: "+ drinkObject.nameDescription());
        System.out.println("Total Price: " + drinkObject.price());
    }

}


abstract class Drink{
    public abstract String nameDescription();
    public abstract double price();
}

class Espresso extends Drink {

    public String nameDescription() {
        return "Expresso" + " with:";
    }
    public double price() {
        return 1;
    }
}

abstract class DrinkDecorator extends Drink {

    protected Drink drink;
    public DrinkDecorator(Drink drinkObject) {
        this.drink = drinkObject;
    }

    public abstract String nameDescription();
    public abstract double price();
}

class ChocolateDecorator extends DrinkDecorator{

    public ChocolateDecorator(Drink drinkObject) {
        super(drinkObject);
    }

    public String nameDescription() {
        return this.drink.nameDescription()+ " Chocolate;";
    }
    public double price() {
        return this.drink.price() + 0.25;
    }
}

class SoyDecorator extends DrinkDecorator{

    public SoyDecorator(Drink drinkObject) {
        super(drinkObject);
    }

    public String nameDescription() {
        return this.drink.nameDescription()+ " Soy;";
    }
    public double price() {
        return this.drink.price() + 0.15;
    }
}