EECS2030E Test 3

Tuesday October 25, 2016, 16:00-17:20
Lab 02
Version F

Instructions

There is one programming question and a set of short answer questions.

Instructions for submitting your programming question solution are given in the Programming question section. You may submit as many times as you want; your most recent submission will be the one recorded.

Instructions for submitting your answers to the short answer questions are given in the Short Answer Questions section. You may submit as many times as you want; your most recent submission will be the one recorded.

Programming question

Implement this API. A skeleton can be found here here. The skeleton compiles, but the constructors are not implemented and most of the methods do not return the correct values; you should complete the constructors and methods to satisfy their APIs. The provided code does not provide you with the non-static fields; you need to decide which fields the class requires.

For reference: the Java API is here.

Submit your program using the following command in a terminal (make sure you are in the directory containing your file Temperature.java):

submit 2030 test3F Weight.java

Short Answer Questions

Question 1

What is a final method?

A. a method that removes the object from memory
B. a method that the implementer can override
C. a method that the implementer can not override
D. a method that the implementer must override

Question 2

Suppose we implement a Person class where a Person has-a Weight. What is the relationship between the classes Person and Weight called if a Person object owns its Weight object?


Question 3 State 3 different test cases for the method equals(Object) in the class Weight. Make sure that the test cases test different ways that the method might fail.

Question 4

Suppose that we wanted to provide the following two constructors for Weight: 

/**
 * Initializes a weight to the given weight in kilograms.
 */
public Weight(double kg) { // implementation not shown }


/**
 * Initializes a weight to the given weight in pounds.
 */
public Weight(double lb) { // implementation not shown }

(a) Why can we not provide both of these constructors?
(b) What technique was described in the lecture slides that could be used in place of one or both of the constructors?



Enter your answers into a text file named answers.txt. You can use the editor of your choice for this. You can also create a text file in Eclipse by selecting "New" and then "Untitled Text File" in the "File" menu. Make sure that you save your file. Also make sure that you indicate which question you are answering, e.g. Q1: answer to question 1 Q2: answer to question 2 Q3:...

Submit your answers using the following command in a terminal (make sure you are in the directory containing your file answers.txt):

submit 2030 test3C answers.txt