Thread: Inheritance question!

Hey there! I have a question involving the code below. The question is:

Which methods does the ChoiceQuestion class inherit from its superclass? Which methods does it override? Which methods does it add?


I'm having trouble deciphering each part of the code from the other... Like, I don't know what we're referring to as the "superclass", so I really can't know what we're overwriting if we can't see the superclass... Anyone able to help me out?

Part 1 of code:

(link removed)

Part 2 of code:

(link removed)

 
 
 
1import java.util.Scanner;
2
3/**
4 This program shows a simple quiz with two choice questions.
5*/
6 public class QuestionDemo2
10 ChoiceQuestion first = new ChoiceQuestion();
11 first.setText("What was the original name of the Java language?");
12 first.addChoice("*7", false);
13 first.addChoice("Duke", false);
14 first.addChoice("Oak", true);
15 first.addChoice("Gosling", false);
16
17 ChoiceQuestion second = new ChoiceQuestion();
18 second.setText("In which country was the inventor of Java born?");
19 second.addChoice("Australia", false);
20 second.addChoice("Canada", true);
21 second.addChoice("Denmark", false);
22 second.addChoice("United States", false);
23
24 presentQuestion(first);
25 presentQuestion(second);
26 }
27
28 /**
29 Presents a question to the user and checks the response.
30 @param q the question
31 */
32 public static void presentQuestion(ChoiceQuestion q)
33 {
34 q.display();
35 System.out.print("Your answer: ");
36 Scanner in = new Scanner(System.in);
37 String response = in.nextLine();
38 System.out.println(q.checkAnswer(response));
}
 
}


import java.util.ArrayList; 
 /**
A question with multiple choices.
 */
 public class ChoiceQuestion extends Question
{
private ArrayList<String> choices;
/**
Constructs a choice question with no choices.
*/
public ChoiceQuestion() {
choices = new ArrayList<String>(); }
/**
Adds an answer choice to this question.
@param choice the choice to add
@param correct true if this is the correct choice, false otherwise
*/
public void addChoice(String choice, boolean correct) {
 
choices.add(Choice);
if (Correct) {
 
// Convert choices.size() to string
String choiceString = "" + choices.size(); setAnswer(choiceString);
} }
public void display()
{
// Display the question text super.display();
// Display the answer choices
for (int i = 0; i < choices.size(); i++) {
int choiceNumber = i + 1;
System.out.println(choiceNumber + ": " + choices.get(i)); }
} }

It's not my code... it's directly from a textbook.