Need help with arrays in a survey

Question

I am making a survey using arrays to store the answers to 2 questions and output the frequencies of each answer, as well as the average rating for each question. When I do it in a structured manner, it works properly:
import java.text.DecimalFormat;  //in order to format numbers
import javax.swing.*;
public class Music1
  public static void main (String[] args)
    int iCount = 0, iResponsesSum1 = 0, iResponsesSum2 = 0, iParticipants;
    double dResponsesAve1 = 0, dResponsesAve2 = 0;
    String sInput = "", sOutput = "", sOutput1 = "";
    int frequency1[] = new int[6];
    int frequency2[] = new int[6];
    iParticipants = Integer.parseInt(JOptionPane.showInputDialog("Enter the number of participants\nin music taste survey:"));
    int responses1[] = new int[iParticipants];
    int responses2[] = new int[iParticipants];
    for (iCount = 0; iCount < responses1.length; iCount++)//for loop
      responses1[iCount] = Integer.parseInt(JOptionPane.showInputDialog(null, "Please rate Rave music (1: awful - 5: great):", "Participant #" + (iCount + 1) + ":", JOptionPane.QUESTION_MESSAGE));//display first input box
      responses2[iCount] = Integer.parseInt(JOptionPane.showInputDialog(null, "Please rate Rock & Roll music (1: awful - 5 great):", "Participant #" + (iCount + 1) + ":", JOptionPane.QUESTION_MESSAGE));//display second input box
      ++frequency1[responses1[iCount]];
      ++frequency2[responses2[iCount]];
      iResponsesSum1+= responses1[iCount];//sum answers for first question
      iResponsesSum2+= responses2[iCount];//sum answers for second question
    }//end for loop
    for (int rating = 1; rating < frequency1.length; rating++)
      sOutput1+=  " Participants who left rating " + rating + " \t" + frequency1[rating] + "\t" + frequency2[rating] + "\n";
    }//end for loop
    dResponsesAve1 = iResponsesSum1/(double)(responses1.length);
    dResponsesAve2 = iResponsesSum2/(double)(responses2.length);
    DecimalFormat myFormat = new DecimalFormat("0.00");
    sOutput = "\tMusic Survey Results\n\n\n\n" +
       " Number of participants: " + iParticipants + "\n\n" +
       " Rave average rating:  " + myFormat.format(dResponsesAve1) + "\n" +             " Rock average rating:  " + myFormat.format(dResponsesAve2) + "\n\n\n" +
       "\tRatings by music:\n\n" +
       "\t\t" +
       "Rave\tRock" + "\n" +
       sOutput1 + "\n";
    JTextArea outputArea = new JTextArea(20, 15);
    outputArea.setText(sOutput);
    JOptionPane.showMessageDialog(null, outputArea, "Music Survey", JOptionPane.PLAIN_MESSAGE);//output the message
  System.exit(0);//exit the program
  }//end main
}//end classNow, the problems start when I try to transform that into classess that create survey object and methods to be performed on that object.
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
public class Music
     public int iCount;
     public int iRating;
     private int iResponsesSum1;
     private int iResponsesSum2;
     private int iParticipants;
     private double dResponsesAve1;
     private double dResponsesAve2;
     private String sInput;
     private String sOutput1;
     private String sOutput;
     private int responses1[];
     private int responses2[];
     private int frequency1[];
     private int frequency2[];
     public Music()
          setParticipants();
          iCount = 0;
          iRating = 0;
          iResponsesSum1 = 0;
          iResponsesSum2 = 0;
          iParticipants = 0;;
          dResponsesAve1 = 0;
          dResponsesAve1 = 0;
          iParticipants = 0;
          sInput = "";
          sOutput = "";
          sOutput1 = "";
          responses1 = new int[iParticipants];
          responses2 = new int[iParticipants];
          frequency1 = new int[6];
          frequency2 = new int[6];
     public void setParticipants()
          iParticipants = Integer.parseInt(JOptionPane.showInputDialog("Enter the number of participants\nin music taste survey:"));
     public int getParticipants()
          return iParticipants;
     public void setResponses1()
          for (iCount = 0; iCount < responses1.length; iCount++)//for loop
               responses1[iCount] = Integer.parseInt(JOptionPane.showInputDialog(null, "Please rate Rave music (1: awful - 5: great):", "Participant #" + (iCount + 1) + ":", JOptionPane.QUESTION_MESSAGE));//display first input box
     public void setResponses2()
          for (iCount = 0; iCount < responses1.length; iCount++)//for loop
               responses2[iCount] = Integer.parseInt(JOptionPane.showInputDialog(null, "Please rate Rock & Roll(1: awful - 5: great):", "Participant #" + (iCount + 1) + ":", JOptionPane.QUESTION_MESSAGE));//display second input box
     public void setFrequency1()
          ++frequency1[responses1[iCount]];     
     public void  setFrequency2()
          ++frequency1[responses1[iCount]];     
     public void  setSum1()
          iResponsesSum1+= responses1[iCount];//sum answers for first question
     public int getSum1()
          return iResponsesSum1;
     public void  setSum2()
          iResponsesSum2+= responses2[iCount];//sum answers for first question     
     public int getSum2()
          return iResponsesSum2;
     public void setFrequenciesByRating()
          sOutput1+=  "Participants who left rating " + iRating + "               " + frequency1[iRating] + "                        " + frequency2[iRating] + "\n";
     public String getFrequenciesByRating()
          return sOutput1;
     public double getAverage1()
          dResponsesAve1 = getSum1()/(double)(responses1.length);
          return dResponsesAve1;
     public double getAverage2()
          dResponsesAve2 = getSum2()/(double)(responses2.length);
          return dResponsesAve2;
     public String toString()
          DecimalFormat myFormat = new DecimalFormat("0.00");
          sOutput = "                        Music Survey Results\n\n\n\n" +
               "Number of participants: " + getParticipants() + "\n\n" +
               "Rave average rating:  " + myFormat.format(getAverage1()) + "\n" +
               "Rock average rating:  " + myFormat.format(getAverage2()) + "\n\n\n" +
               "                        Ratings by music:\n\n" +
               "                                                          " +
               "Rave       Rock" + "\n" +
               getFrequenciesByRating() + "\n";
          return sOutput;
}Here is what I have for the main program:
mport java.text.DecimalFormat;  //in order to format numbers
import javax.swing.JOptionPane;
public class MusicApp
     public static void main (String[] args)
          int iCount = 0, iRating = 0;
          int responses1[] = new int[6];
          Music survey = new Music();
          for (int iCount1 = 0; iCount1 < responses1.length; iCount1++)
               survey.setResponses1();
          for (int iCount2 = 0; iCount2 < responses1.length; iCount2++)
               survey.setResponses2();
          for (int iCount3 = 0; iCount3 < responses1.length; iCount3++)
               survey.setFrequency1();
          for (int iCount4 = 0; iCount4 < responses1.length; iCount4++)
               survey.setFrequency2();
          for (iRating = 1; iRating < responses1.length; iRating++)
               survey.setFrequenciesByRating();
          JOptionPane.showMessageDialog(null,survey.toString(), "Music Survey", JOptionPane.PLAIN_MESSAGE);//output the message
          System.exit(0);//exit the program
}This obviously doesn't work, it gives me an ArrayIndexOutOfBoundsException.
I tried to twist it in every way I could think of, but I still couldn't get it to work. I would like the program to run as it does in the structured form.
I think I have a problem with the scope of the variables, but I am really not sure, that's why I hope that someone can give me some insight into what I am doing wrong.
So, please, any constructive comment or advice is greatly appreciated.

Answer 1

By the way, have a good look at your Music constructor:
setParticipants(); //this will only be called once!
iCount = 0;
iRating = 0;
iResponsesSum1 = 0;
iResponsesSum2 = 0;
iParticipants = 0;; //double semicolon :)
dResponsesAve1 = 0;
dResponsesAve1 = 0;
iParticipants = 0; //!!
sInput = "";
sOutput = "";
sOutput1 = "";
responses1 = new int[iParticipants]; //this creates an array of int with size 0 (see iParticipants)
responses2 = new int[iParticipants]; //idem
frequency1 = new int[6]; //this creates an array of size 6 [0,0,0,0,0,0]
frequency2 = new int[6]; //idem