Trio free response problem from the 2014 AP Computer Science A Exam.
Trio is #4 from the from the 2014 AP Computer Science A Free Response problems.
http://media.collegeboard.com/digitalServices/pdf/ap/ap14_frq_computer_science_a.pdf
Trio class
public class Trio implements MenuItem
{
private Sandwich sandwich;
private Salad salad;
private Drink drink;
public Trio(Sandwich sand, Salad sal, Drink dr)
{
sandwich = sand;
salad = sal;
drink = dr;
}
public String getName()
{
return sandwich.getName() + "/" + salad.getName() + "/" + drink.getName() + " Trio";
}
public double getPrice()
{
MenuItem cheapest = sandwich;
if(salad.getPrice() < cheapest.getPrice())
cheapest = salad;
if(drink.getPrice() < cheapest.getPrice())
cheapest = drink;
return sandwich.getPrice() + salad.getPrice() + drink.getPrice() - cheapest.getPrice();
}
}
Hi Mr. Horn,
Instead of creating private instance variables for each of the item types, I simply created “private double price” and “private String name” and generated the names and prices in the constructor; therefore all I had in the method bodies were return statements. Is this okay?
Yes.
In the getPrice method, I didn’t use a long series of if statements like you did. Instead I wrote if(drink.getPrice == 1.25) return 2.75; else return 3.5; Does that work and receive full credit?
No. Those numbers were just an example. The code for the class needs to work for any prices.
for getName(), I created sepreate Strings (s1,s2,s3)to get the names for the food and then I did return s1 + “/” + s2 + “/” + s3 + ” Trio”;
That works.