Java(TM) Boutique - Coupling and Cohesion: The Two Cornerstones of OO Programming

Listing 1: An Imaginary Order Class


public class Order {


    private boolean underPromotion;
    private String deliveryType;
    private int totalAmount;
    private int orderNumber;
    private Product prod;

    public Order(Product prod, String deliveryType, boolean underPromotion) {

        this.prod = prod;
        this.deliveryType = deliveryType;
        this.underPromotion = underPromotion;
        this.totalAmount = prod.getPrice();

        this.orderNumber = 100; // we will actually assign a number here.

    }


    public int getPromotionalPrice() {

        if (underPromotion) {
            totalAmount = totalAmount - 6;
        }

       return totalAmount;

    }


    public boolean checkIfProductExists() {

       return prod != null;

    }


    public String getOrderInfo() {

        return prod.toString() + orderNumber + totalAmount + deliveryType + underPromotion;


    }


    public int getOrderPrice() {

        if (deliveryType.equalsIgnoreCase("special")) {

            totalAmount = totalAmount + 6;

        }

        return totalAmount;

    }

}

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