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Quick question regarding reading a file and storing it..

 
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NotReallySureWhatGoesHere
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PostPosted: Mon Mar 05, 2012 6:44 am    Post subject: Quick question regarding reading a file and storing it.. Reply with quote
Alright so I'm trying to make a simple quiz game in Java and I'm stuck at how I want to read the file with the questions and answers.

It will be in a format like this: question:answer1:answer2:answer3:answer4:id (then a new line and repeat)

and I'm trying to figure out how I can read this and store these each in to a string.

I started to use a Map<String, Integer> but I can't seem to retrieve from IDs, only the string part.

I don't really want to do a string array either. Is there any other way? I need to keep the id with it so when I check to see if the question has been asked it can do that fast since there might be a lot of questions. Thanks. Any pseudo-code will be great.

EDIT: Here is some of what I have:

Code:
package com.fbla;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Scanner;

/**
 *
 * @author Josh
 */
public class Questionaire {

    private Scanner scnr;
    private String strQ;
    private int id;
    private ArrayList<Integer> ids;
    private HashMap<String, Integer> map;

    public Questionaire(String strFilePath) {
        scnr = new Scanner(strFilePath);
        ids = new ArrayList<Integer>();
        map = new HashMap<String, Integer>();
        String str;

        while (scnr.hasNext()) {
            str = scnr.next();
            strQ = str.split(":")[5];
            id = Integer.valueOf(str.split(":")[6]).intValue();

            map.put(strQ, id);
        }
    }

    public String getQuestion(int qID) {
        return null;
    }
}


The getQuestion method is what I want to call to get a question with the specified ID. Currently what I have there won't work, it's just there Razz
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HomerSexual
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PostPosted: Mon Mar 05, 2012 8:20 am    Post subject: Re: Quick question regarding reading a file and storing it.. Reply with quote
One Bored Motherfucka wrote:
Alright so I'm trying to make a simple quiz game in Java and I'm stuck at how I want to read the file with the questions and answers.

It will be in a format like this: question:answer1:answer2:answer3:answer4:id (then a new line and repeat)

and I'm trying to figure out how I can read this and store these each in to a string.

I started to use a Map<String, Integer> but I can't seem to retrieve from IDs, only the string part.

I don't really want to do a string array either. Is there any other way? I need to keep the id with it so when I check to see if the question has been asked it can do that fast since there might be a lot of questions. Thanks. Any pseudo-code will be great.

EDIT: Here is some of what I have:

Code:
package com.fbla;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Scanner;

/**
 *
 * @author Josh
 */
public class Questionaire {

    private Scanner scnr;
    private String strQ;
    private int id;
    private ArrayList<Integer> ids;
    private HashMap<String, Integer> map;

    public Questionaire(String strFilePath) {
        scnr = new Scanner(strFilePath);
        ids = new ArrayList<Integer>();
        map = new HashMap<String, Integer>();
        String str;

        while (scnr.hasNext()) {
            str = scnr.next();
            strQ = str.split(":")[5];
            id = Integer.valueOf(str.split(":")[6]).intValue();

            map.put(strQ, id);
        }
    }

    public String getQuestion(int qID) {
        return null;
    }
}


The getQuestion method is what I want to call to get a question with the specified ID. Currently what I have there won't work, it's just there Razz


Even though you don't want to use a string array I would. Just for reading the file it would be something like

Code:

Scanner scan = new Scanner(new File("filename"));
while(scan.hasNextLine())
{
String[] tokens = scan.nextLine().split(":");
//each token is a position in the array here, you could also use a string
//tokenizer but this will work fine for  valid input
}



Personally I would not put these into a map because you don't record the structure. I would create a Question class which has the question and 4 answers and the id and then write out the question class like

Code:

//given an ArrayList<Question> containing all questions
PrintStream out = new PrintStream(new File(outFileName));
for(Question q: questions)
{
out.println(q.getQuestion() + ":" + q.getAnswerOne() + ":" + ... + q.getId());
}
out.close();


Java is an OO language, make use of it. Also maps aren't really that great'

Edit: I didn't see the name of your class oops
I see you have the right idea with the Questionare class but I still wouldn't store them in a map, I would store them in either an array or an ArrayList because maps are overkill for this problem.
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atom0s
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PostPosted: Mon Mar 05, 2012 3:51 pm    Post subject: Reply with quote
Or perhaps look into serialization or other methods of storing the data rather then stressing yourself over your own method. Something such as:
- XML
- Json
- CSV
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NotReallySureWhatGoesHere
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PostPosted: Mon Mar 05, 2012 6:19 pm    Post subject: Reply with quote
Thanks for the replies and tips guys! I'm going to try some things and post back Wink And you've helped me understand OOP a bit more with that Question class. Wow a lot of things could be easier haha.

EDIT: Alright things seem to be going smooth Wink Here is my updated code for anyone who is interested. Also if you guys have anymore suggestions on how to improve please let me know, thanks!


Code:
package com.fbla;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Scanner;

/**
 *
 * @author Josh
 */
public class Questionaire {

    public ArrayList<Question> questions = new ArrayList<Question>();
    public Question q = new Question();
    public ArrayList<Integer> usedIDS = new ArrayList<Integer>();

    public Questionaire(String strFilePath) throws FileNotFoundException {
        Scanner scnr = new Scanner(new File(strFilePath));
        String[] tokens;

        while (scnr.hasNextLine()) {
            tokens = scnr.nextLine().split(":");

            q.setQuestion(tokens[0]);
            q.setAnswerOne(tokens[1]);
            q.setAnswerTwo(tokens[2]);
            q.setAnswerThree(tokens[3]);
            q.setAnswerFour(tokens[4]);
            q.setQuestionID(Integer.valueOf(tokens[5]).intValue());

            questions.add(q);
            usedIDS.add(q.getQuestionID());
        }
    }
}


Code:
package com.fbla;

/**
 *
 * @author Josh
 */
public class Question {

    private int id;
    private String strQuestion, strAnswerOne, strAnswerTwo, strAnswerThree, strAnswerFour;

    public Question() {
    }

    public String getQuestion() {
        return strQuestion;
    }

    public void setQuestion(String str) {
        strQuestion = str;
    }

    public String getAnswerOne() {
        return strAnswerOne;
    }

    public void setAnswerOne(String str) {
        strAnswerOne = str;
    }

    public String getAnswerTwo() {
        return strAnswerTwo;
    }

    public void setAnswerTwo(String str) {
        strAnswerTwo = str;
    }

    public String getAnswerThree() {
        return strAnswerThree;
    }

    public void setAnswerThree(String str) {
        strAnswerThree = str;
    }

    public String getAnswerFour() {
        return strAnswerFour;
    }

    public void setAnswerFour(String str) {
        strAnswerFour = str;
    }

    public int getQuestionID() {
        return id;
    }

    public void setQuestionID(int i) {
        id = i;
    }
}
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NotReallySureWhatGoesHere
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PostPosted: Tue Mar 06, 2012 9:47 pm    Post subject: Reply with quote
Here's a minor update:

Code:
package com.fbla;

import java.io.File;
import java.io.FileNotFoundException;
import java.util.ArrayList;
import java.util.Random;
import java.util.Scanner;

/**
 *
 * @author Josh
 */
public class Questionaire {

    private ArrayList<Question> questions = new ArrayList<Question>();
    private Random rnd = new Random();

    public Questionaire(String strFilePath) {
        Scanner scnr = null;

        try {
            scnr = new Scanner(new File(strFilePath));
        } catch (FileNotFoundException fnfe) {
        }

        String[] tokens;

        while (scnr.hasNextLine()) {
            tokens = scnr.nextLine().split(":");

            questions.add(new Question(tokens[0], tokens[1], tokens[2], tokens[3], tokens[4], tokens[5].charAt(0)));
        }
    }

    public Question getRandomQuestion() {
        return questions.get(rnd.nextInt(questions.size()));
    }
}


Code:
package com.fbla;

/**
 *
 * @author Josh
 */
public class Question {

    private String strQuestion, strAnswerOne, strAnswerTwo, strAnswerThree, strAnswerFour;
    private char chrAnswer;

    public Question(String strQ, String strOne, String strTwo, String strThree, String strFour, char chrAns) {
        strQuestion = strQ;
        strAnswerOne = strOne;
        strAnswerTwo = strTwo;
        strAnswerThree = strThree;
        strAnswerFour = strFour;
        chrAnswer = chrAns;
    }

    public String getQuestion() {
        return strQuestion;
    }

    public String getAnswerOne() {
        return strAnswerOne;
    }

    public String getAnswerTwo() {
        return strAnswerTwo;
    }

    public String getAnswerThree() {
        return strAnswerThree;
    }

    public String getAnswerFour() {
        return strAnswerFour;
    }

    public char getCharAnswer() {
        return chrAnswer;
    }
}


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HomerSexual
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PostPosted: Wed Mar 07, 2012 8:01 am    Post subject: Reply with quote
Code:
package com.fbla;

/**
 *
 * @author Josh
 */
public class Question {

    private char chrAnswer;
   private String[] answers;
   private String question;


    public Question(String strQ, String strOne, String strTwo, String strThree, String strFour, char chrAns) {
        strQuestion = strQ;
        answers[0] = strOne;
          answers[1] = strTwo;
        answers[2] = strThree;
        answers[3] = strFour;
        chrAnswer = chrAns;
    }

    public String getQuestion() {
        return strQuestion;
    }

    public String getAnswer(int which)
   {
      return answers[which-1];
   }
    public void setAnswer(int which, String newAnswer)
    {
        answers[which-1] = newAnswer;
    }

    public char getCharAnswer() {
        return chrAnswer;
    }
}

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NotReallySureWhatGoesHere
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PostPosted: Wed Mar 07, 2012 2:04 pm    Post subject: Reply with quote
HomerSexual wrote:
Code:
package com.fbla;

/**
 *
 * @author Josh
 */
public class Question {

    private char chrAnswer;
   private String[] answers;
   private String question;


    public Question(String strQ, String strOne, String strTwo, String strThree, String strFour, char chrAns) {
        strQuestion = strQ;
        answers[0] = strOne;
          answers[1] = strTwo;
        answers[2] = strThree;
        answers[3] = strFour;
        chrAnswer = chrAns;
    }

    public String getQuestion() {
        return strQuestion;
    }

    public String getAnswer(int which)
   {
      return answers[which-1];
   }
    public void setAnswer(int which, String newAnswer)
    {
        answers[which-1] = newAnswer;
    }

    public char getCharAnswer() {
        return chrAnswer;
    }
}


Ah very clever! Cool
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