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Thread: Inheritance question!

  1. #1
    Member Scorks's Avatar
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    Default 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)


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Inheritance question!

    I've removed your links, as they look pretty spammy to me. Can't you just post the code as an SSCCE, using the highlight tags?
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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    PhHein (September 23rd, 2013)

  4. #3
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    Default Re: Inheritance question!

     
     
     
    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)); }
    } }

  5. #4
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    Default Re: Inheritance question!

    Yikes, is that really how you format your code? I'd recommend using proper indentation, if only for your own sanity.

    I also don't see a Question class, but I could be missing it in your unformatted code.

    But what's your question now? What part of your homework are you stuck on?
    Useful links: How to Ask Questions the Smart Way | Use Code Tags | Java Tutorials
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    Default Re: Inheritance question!

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

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