Coding Exercises: Lists of Objects
Items
Write a class Item, representing a single item you can buy at a store. You should include:
- private member variables for the name (String) and price (float) of the item
- a constructor that sets these member variables
- public accessor functions for the member variables
Write a class ItemCalculator that calculates various things about a list of Item objects. Include these functions:
- a function that takes an ArrayList of Item objects as input, and prints the names and prices of the items in the list (returns nothing)
- a function that takes an ArrayList of Item objects as input, and
returns
the average price of the items - a function that takes an ArrayList of Item objects as input, and returns the name of the most expensive Item
Write unit tests for all ItemCalculator functions that return a value, to demonstrate that the functions are working correctly. These tests can be written in the ItemCalculator class, or in an external ItemCalculatorTest class.
Persons
Write a class Person, including:
- private member variables for the person’s name (String) and number of pets (int)
- a constructor that sets these member variables
- public accessor functions for the member variables
Write a class PersonStats that calculates various things about lists of Person objects. Include three functions:
- a function that takes an ArrayList of Person objects, and calculates the average number of pets
- a function that takes an ArrayList of Person objects, and returns the name of the person with the most pets
- a function that takes an ArrayList of Person objects, and returns an ArrayList of Person objects representing those people who have at least 2 pets.
Write unit tests for all PersonStats functions that return a value, to demonstrate that the functions are working correctly. These tests can be written in PersonStats, or in an external PersonStatsTest class.