Assignment 5

Introduction

In this assignment, you are to modify an existing class and create several other unrelated classes. You are to add features involving equality to each class. In addition, for each class that you create, you must provide a constructor whose parameters should be all the instance variables of the class, in the same order we use to describe the instance variables in the questions. We shall be autotesting your programs and our autotesting program will expect exactly the information we require, no more and no less. Do not print anything in any of your classes as this will cause the autotester to reject your results. In addition, be certain that the constructors have the correct parameters in the correct order as failure to do so will also cause unhappiness for the autotester and hence for you.

Instructions

1. Obtain the class Counter from Assignment 3 and add an equals method to it. Two Counter objects are equal if they have the same current value and the same increment. You should not create a constructor for this class.

2. Write a class FoodOrder that has two instance variables: the name of the food that was ordered and the number of servings of that food (an int). Write a constructor and an equals method for this and all subsequent classes. Two FoodOrder objects are equal if the name of the food is the same and the number of servings is the same.

3. A wicked witch has hired you to write a class to keep track of children she has in storage. Class Child should have as instance variables the name of the child, the mass of the child (in kilograms, as a double), and the height of the child (in centimetres, as an int). To the witch, two Child objects are equal if they have the same mass (to within 0.25 kg) and the same height.

4. Write a class WeatherSensor that has two instance variables, one of type Thermometer (for temperature in degrees Celsius: an int) and the other of type Barometer (for air pressure in kiloPascals: a double). Write all three classes, with constructors and equals methods for all three. Two Thermometers are considered equal if the temperatures are equal. Two Barometers are considered equal if the air pressures are within 0.1 kPa of each other.

   Here's the tricky bit: WeatherSensors may be incomplete, missing either the Thermometer or Barometer, or both. Two WeatherSensors are equal if their Thermometers are equal (or both are missing) and their Barometers are equal (or both are missing).

5. Write a class TempWorker that has as instance variables a name (a String), the number of words per minute that the worker can type (an int), and an indication of whether the worker is experienced with computers (a boolean: true if the worker is experienced, false if not).

   Two TempWorkers are equal when either of the following are true:

   • They are both experienced with computers, or
   • They are both inexperienced with computers and they can type the same number of words per minute.

6. Electronically submit all seven .java files following the directions for your campus.