Enums for Safety

Goal

In this lab, you'll change all of our hard-coded string options (Small, Regular, Milk, etc.) to be enums for type-safety.

A. Create a Size Enum

1. Create an enum class named SizeOption that has three choices: SMALL, MEDIUM, and LARGE

   Enum Coding Style

   It's standard Java coding style to have these be all upper-case letters.

   Enum Tutorial

   A small tutorial is here.

2. Add this toString() implementation to the enum so that it prints more nicely:

   @Override
   public String toString() {
     String name = name().toLowerCase();
     return Character.toUpperCase(name.charAt(0)) + name.substring(1);
   }
   

3. Change the tests for CoffeeOrder to use the enum instead of the hard-coded String. For example:

   CoffeeOrder order = new CoffeeOrder();
   
   order.size(SizeOption.LARGE);
   
   assertThat(order.price())
       .isEqualTo(200);
   

B. Create Enums for Sweetener and Creamer

Do the same for Creamer and Sweetener:

1. Replace the String for creamer type with a new enum CreamerOption, that has options for NONE, MILK, HALF_N_HALF.

2. Add the toString implementation from above.

3. Change the tests to use this enum.

4. Make sure the tests continue to pass.

5. Do the same for Sweetener, using a new enum SweetenerOption, with NONE, SUGAR, and SPLENDA.

6. Add the toString implementation from above.

7. Make sure the tests continue to pass.

---

Once you've completed the above steps, check in with the instructor to review your code.

---

C. Use Enum Constructor for Better toString

[comment]: <> !!!TODO!!!