I need help on this one.... Write a program that takes as input student scores f

Question

I need help on this one....

Write a program that takes as input student scores from a file and outputs the average for each student to a file.

The input file will have the following format:
studentid1 score1 score2 score3 score4
studentid2 score1 score2 score3

The output file will have the following format:
studentid1 average_score
studentid2 average_score

So, if the input file has the following data:
0896 - 8 9 10 8
12345 - 9 9 9
8789 - 8 7 6

The output file will look like:
0896 - 8.75
12345 - 9
8789 - 7

* The input file name will be “studentScore.dat” and output file will be “studentAvgScore.dat”
* Student id will always be the first value in every line, it can begin with 0; if the student id begins with 0, the output file should display the student id as it appears in the input file (hint: what happens if nextInt is used to read the first token)
* Nested loop will be required, the outer loop will read each line and the inner loop will process tokens for each input line

Explanation / Answer

import java.io.*;
import java.util.*;

public class Student {

    private java.util.ArrayList studentId;
    private java.util.ArrayList avgScore;

    Student() {
        studentId = new ArrayList();
        avgScore = new ArrayList();
    }

    public void readFile(String fileName) {
        try {
            // Create FileReader Object
            FileInputStream inputFileReader = new FileInputStream(fileName);

            DataInputStream in = new DataInputStream(inputFileReader);
            BufferedReader inputStream = new BufferedReader(
                    new InputStreamReader(in));

            String inLine = null;
            while ((inLine = inputStream.readLine()) != null) {
                StringTokenizer token = new StringTokenizer(inLine, " ");
                int index = 0;
                double score = 0.0, total = 0.0;
                while (token.hasMoreTokens()) {
                    if (index == 0) {
                        studentId.add(token.nextToken());
                        token.nextToken();
                        index++;
                    } else {
                        score = score + Integer.parseInt(token.nextToken());
                        total++;
                    }
                }
                avgScore.add(score / total);

            }

            inputStream.close();
            in.close();

        } catch (IOException e) {
            System.out.println("IO Exception : " + e.getMessage());
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("Exception : " + e.getMessage());
        } finally {
        }
    }

    public void writeFile(String fileName) {
        try {
            FileWriter fstream = new FileWriter(fileName);
            BufferedWriter out = new BufferedWriter(fstream);
            for (int i = 0; i < studentId.size(); i++) {
                out.write(studentId.get(i) + " - " + avgScore.get(i));
                out.newLine();
            }

            out.close();
        } catch (Exception e) {
            System.out.println("StoreData Exception : " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        Student stud = new Student();
        stud.readFile("studentScore.dat");
        stud.writeFile("studentAvgScore.dat");
    }
}
import java.io.*;
import java.util.*;

public class Student {

    private java.util.ArrayList studentId;
    private java.util.ArrayList avgScore;

    Student() {
        studentId = new ArrayList();
        avgScore = new ArrayList();
    }

    public void readFile(String fileName) {
        try {
            // Create FileReader Object
            FileInputStream inputFileReader = new FileInputStream(fileName);

            DataInputStream in = new DataInputStream(inputFileReader);
            BufferedReader inputStream = new BufferedReader(
                    new InputStreamReader(in));

            String inLine = null;
            while ((inLine = inputStream.readLine()) != null) {
                StringTokenizer token = new StringTokenizer(inLine, " ");
                int index = 0;
                double score = 0.0, total = 0.0;
                while (token.hasMoreTokens()) {
                    if (index == 0) {
                        studentId.add(token.nextToken());
                        token.nextToken();
                        index++;
                    } else {
                        score = score + Integer.parseInt(token.nextToken());
                        total++;
                    }
                }
                avgScore.add(score / total);

            }

            inputStream.close();
            in.close();

        } catch (IOException e) {
            System.out.println("IO Exception : " + e.getMessage());
        } catch (Exception e) {
            e.printStackTrace();
            System.out.println("Exception : " + e.getMessage());
        } finally {
        }
    }

    public void writeFile(String fileName) {
        try {
            FileWriter fstream = new FileWriter(fileName);
            BufferedWriter out = new BufferedWriter(fstream);
            for (int i = 0; i < studentId.size(); i++) {
                out.write(studentId.get(i) + " - " + avgScore.get(i));
                out.newLine();
            }

            out.close();
        } catch (Exception e) {
            System.out.println("StoreData Exception : " + e.getMessage());
        }
    }

    public static void main(String[] args) {
        Student stud = new Student();
        stud.readFile("studentScore.dat");
        stud.writeFile("studentAvgScore.dat");
    }
}

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