SE450: Homework [41/41]

Goal: To extend your Flight class to provide more functionality, to get familiar with the canonical form of classes, and to get familiar with JUnit - you will write the JUnit unit tests to prove that your code works.

Read Chapter 3 of Joshua Bloch's Effective Java. It will help you as you do the homework assignment this week. You can also refer to Jia Chapter 6.

Take your existing Flight class from hw3. Put it in the package se450.<studentid>.hw4.

Implement the java.lang.Comparable interface in your Flight class. Override the compareTo method in this interface so that Flightss are sorted properly. Proper sorting should be such that the following is true:

• A Flight is sorted first by Airline first (alphabetically)
• Next, a Flight is sorted by arrival time (sort numerically for now)
• Finally, a flight is sorted by departing airport (alphabetically)

Also write an equals method for Flight. A Flight is equal to another if they have the same Airline and Flight number

Write a test using JUnit which proves that your Comparable implementation and equals function actually works. You should create at least three (maybe more) Flight objects in your setUp method. They should be stored in an array (or Collection) of Flight objects. Have your test sort the code using one of the Arrays.sort or Collections.sort methods.

To prove that your equals methods work, make sure you meet the contract, i.e. you support the reflexive, symmetric, transitive, consistent, and null reference properties of the equals method. Your unit test for equals should exercise all of these properties. See chapter 3 of Block, the JavaDoc for Object.equals(), and 6.3.2 of Jia for help.

Due next Monday at 5:30 PM.