PurchaseProcessTemplate.java

public abstract class PurchaseProcessTemplate {

    public final void processPurchase() {
        greetCustomer();
        doSelectItems();
        doPurchaseItems();
        doDeliverItems();
        thankCustomer();
    }

    public final void greetCustomer() {
        System.out.println("Welcome to Elle's Boutique");
    }

    public abstract void doSelectItems();
    
    public abstract void doPurchaseItems();

    public abstract void doDeliverItems();

    public final void thankCustomer() {
        System.out.println("Thank you for shopping at Elle's Boutique");
    }
}