Enum for Safety

Goal

In this lab, you'll add a new constructor for your CoffeeOrder that takes a SizeOption enum instead of a String, so that we can be sure it's used correctly at compile-time instead of getting a runtime error.

Step 1: Create an Enum

• Create an enum called SizeOption that has three choices: SMALL, MEDIUM, and LARGE

  Note: If you implemented Extra Large in the prior labs, then also create an enum named EXTRA_LARGE

  Java Style

  It's standard coding style to have Enums be all upper-case.

  Enum Example

  Here's an example of an enum:

  public enum Priority {
    HIGH,
    MEDIUM,
    LOW
  }
  

Step 2: Write a New Test

Create a new CoffeeOrder test that uses this new enum to create a coffee order, something like this:

CoffeeOrder order = new CoffeeOrder(SizeOption.LARGE);

assertThat(order.price())
  .isEqualTo(200);

This will fail to compile, which you'll fix in the next step.

Step 3: Create Constructor

• Create a new constructor in CoffeeOrder that has SizeOption as a parameter.

• Convert as appropriate, the SizeOption enum to a string so you can use the existing Size class.

• Make sure all tests pass.

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

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