Question

Java Code.

Using Decorator pattern make class BurgerToppings:

-Each topping is an extra $1 and the name provided in the constructor

-getTotalPrice: returns total price of burger + toppings

-getDetails: returns the burger name + name of topping with the word (extra)

Code:

public interface Burger{
    double C();
    String getDetails();
}

public class BigMac implements Burger{
    private String order;
    private double price ;

    public BigMac() {
        this.order= "Big Mac";
        this.price = 4.00;
    }

    @Override
    public double getPrice() {
        return price;
    }

    @Override
    public String getorder() {
        return name;
    }
}

Output expected:

Ordering BigMac + extra pickles+ extra cheese
Total price = 6.0

Answer 1

Please find the answer below.
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Burger.java

package c15;
public interface Burger{
double getPrice();
String getorder();
}

BurgerToppings.java

package c15;

public class BurgerToppings {
   private String name;
   BurgerToppings(String n){
       name = n;
   }
   public String getName() {
       return name;
   }
   public void setName(String name) {
       this.name = name;
   }
}

BigMac.java

package c15;

import java.util.ArrayList;

public class BigMac implements Burger{
   private String order;
   private double price;
   private ArrayList<BurgerToppings> toppings;

   public BigMac() {
       this.order= "Big Mac";
       this.price = 4.00;
       toppings = new ArrayList<BurgerToppings>();
   }
  
   void addTopping(String top) {
       toppings.add(new BurgerToppings(top));
   }
   @Override
   public double getPrice() {
       // TODO Auto-generated method stub
       return 0;
   }

   @Override
   public String getorder() {
       String topping="";
       for(BurgerToppings t : toppings) {
           topping += " Extra "+t.getName();
       }
       return order+topping;
   }

  
   public double getTotalPrice() {
       double top=toppings.size();
       return top+price;
   }
  
  
   public static void main(String[] args) {
       BigMac mac = new BigMac();
       mac.addTopping("Cheese");
       mac.addTopping("pickles");
       System.out.println("Ordering "+mac.getorder());
       System.out.println("Total price = "+mac.getTotalPrice());
   }
}