Android create multidimensional array and get value

Question

My first language is PHP :) and newbie to Android and Java. I am trying to understand Array system in Java as it is quite different than PHP. So far understood Java has two different types of arrays (correct me if I am wrong). arr[] and ArrayList<> Also unlike PHP in Java we have to define datatypefor the array.

I am making a simple quiz app (without database) just to learn. For that I want to create a multidimensional array containing question, answer and options like this.

{
    {
        question,
        {option1, option2, option 3, ...}
        answer
    }

    {
        question,
        {option1, option2, option 3, ...}
        answer
    }

    {
        question,
        {option1, option2, option 3, ...}
        answer
    }

    ...
}

I know basics of creating a multidimensional array using arr[][] = {} but I don't know how I can add another array for options to get the similar result as above.

Update

So I want to populate list in this way.

You can make you own Model class, which will have question, options list and answer, then make arraylist of that model class — Abdul Kawee
– Abdul Kawee, Commented Oct 20, 2018 at 6:50
@AbdulKawee thanks for the suggestion.As I said, I am newbie so example code would be highly appreciated and helpful to understand. — Code Lover
– Code Lover, Commented Oct 20, 2018 at 6:51
Do you want structure like this i.e question list i.e q1,q2,q3,q4 answer list i.e a1,a2,a3,a4 you want both list in one list from which you get both ? — Syed Hamza Hassan
– Syed Hamza Hassan, Commented Oct 20, 2018 at 6:53
An ArrayList is not an array. ArrayList is a class. Don't use arrays in general. And don't use multi-dimensional arrays to store various things: define a class Question (as you would in PHP, BTW), and use a List<Question>. Any Java introductory book, or the Java tutorial, describes what a class is. It's a fundamental concept. You need to learn the language and do some research. — JB Nizet
– JB Nizet, Commented Oct 20, 2018 at 6:55
@SyedHamzaHassan In Java I am not so much sure which approach is better but I want to loop through Array to populate questions to create form with radio buttons for the question. Than when user submit I will compare with the answer. — Code Lover
– Code Lover, Commented Oct 20, 2018 at 6:55

Abdul Kawee · Accepted Answer · 2018-10-20 07:11:55Z

2

You can do this by making your own model class as

public class MyCustomModel {

String question;
List<String> options;
String answer;

public MyCustomModel(String question, List<String> options, String answer){
 this.question = question;
 this.options = options;
 this.answer = answer;
}

 // getter and setter methods here

}

And then simply make an array list

private ArrayList<MyCustomModel> myData;

And then add data to List

myData.add(new MyCustomModel("question 1",myListOfOptions, "answer"));

Hope this helps :)

edited Oct 20, 2018 at 7:11

answered Oct 20, 2018 at 7:00

Abdul Kawee

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4 Comments

Code Lover Over a year ago

Thanks a lot. please have a look the reference image I have added on question.

Abdul Kawee Over a year ago

Yes i have checked it, and this code can solve this problem,

Code Lover Over a year ago

Okay. one more question. Should I set myData in activity where I want to use array? Sorry if silly one but I am new and learning it.

Abdul Kawee Over a year ago

please check the edited answer, and accept if it helped you

Syed Hamza Hassan · Accepted Answer · 2018-10-20 08:51:49Z

//You can do it like this, add model class

  public class Quizmodel {

String mAnswer = new String();
String mQuestion = new String();
List<String> mOptions = new ArrayList<>();
public String getmQuestion() {
        return mQuestion;
    }

    public void setmQuestion(String mQuestion) {
        this.mQuestion = mQuestion;
    }

public String getmAnswer() {
        return mAnswer;
    }

    public void setmAnswer(String mAnswer) {
        this.mAnswer= mAnswer;
    }





    public List<String> getmOptions() {
        return mOptions;
    }

    public void setmOptions(List<String> mOptions) {
        this.mOptions = mOptions;
    }
    }

//Set Values for model class, in main class;

   List<Quizmodel> mQuizList = new ArrayList<>();
    String mQuestion = new String();
    mQuestion = "Ask Question Here ?";
    List<String> mOptionsList = new ArrayList<>();
    mOptionsList.add("A1");
    mOptionsList.add("A2");
    mOptionsList.add("A3");

    Quizmodel mModel = new Quizmodel();
    mModel.setmQuestion(mQuestion);
    mModel.setmOptions(mOptionsList);
     mModel.setmAnswer("A2");

    mQuizList.add(mModel);

    //String m = "";
    for (int ind = 0; ind < mQuizList.size(); ind++) {
        System.out.println(mQuizList.get(ind).getmQuestion());
        //  Log.v("response",mQuizList.get(ind).getmQuestion());
        for (int index = 0; index < mQuizList.get(ind).getmAnswers().size(); index++) {
            System.out.print(mQuizList.get(ind).mAnswers.get(index) + " ");
           // m = m + mQuizList.get(ind).mAnswers.get(index) + " ";
        }
System.out.println(mQuizList.get(ind).getmAnswer());
    }

//Just follow step you will get desired result. //Added sample Input and Output.

Sample Output

Ask Question Here ?

Answer Options

A1 A2 A3

A2

//I hope it will bring ease.

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