// This main method is supposed to load the values from a file into
// a double array, then compute the average of the values in this array, writing 
// the average to an output file. Reorder the lines of this main method to
// accomplish this.  Put the main method in a class before running it.

public static void main(String[ ] args)
        throws FileNotFoundException {
    
    double ave = (double) sum / count;
    pw.printf("Average: %.3f\n", ave);
    String line = s.nextLine( );
    int sum = 0;
    int count = 0;
    for(int v : values) {
        PrintWriter pw = new PrintWriter("ave.txt");
        sum += v;
        count++;
    }
    String fileName = "numbers.txt";
    String[ ] inputs = line.split(",");
    Scanner s = new Scanner(f);
    for (int i = 0; i < len; i++) {
        values[i] = Integer.parseInt(inputs[i]);
        pw.close( );
    }
    int len = inputs.length;
    File f = new File(fileName);
    int[ ] values = new int[len];
}

----------------------------------------------------------------
// Ans: Here are the reordered lines.
// Try reordering the lines yourself before looking at the answer.

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

public class Main {
    public static void main(String[] args)
            throws FileNotFoundException {
        File f = new File("numbers.txt");
        Scanner s = new Scanner(f);
        String line = s.nextLine( );
        String[ ] inputs = line.split(",");
        int len = inputs.length;
        int[ ] values = new int[len];
        for (int i = 0; i < len; i++) {
            values[i] = Integer.parseInt(inputs[i]);
        }
        int sum = 0;
        int count = 0;
        for(int v : values) {
            sum += v;
            count++;
        }
        double ave = (double) sum / count;
        System.out.printf("Average: %.3f\n", ave);
    }
}

--------------------------------------------------------------
// Ans: Refactored source code with loadValuesFromFile 
// and computeAverage methods extracted.

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

public class Main {
    public static void main(String[] args)
            throws FileNotFoundException {

        String fileName = "numbers.txt";

        int[ ] values = loadValuesFromFile(fileName);
        double ave = computeAverage(values);

        PrintWriter pw = new PrintWriter("ave.txt");
        pw.printf("Average: %.3f\n", ave);
        pw.close( );
    }

    public static double computeAverage(int[] values) {
        int sum = 0;
        int count = 0;
        for (int v : values) {
            sum += v;
            count++;
        }
        return (double) sum / count;
    }

    public static int[] loadValuesFromFile(String fileName) 
            throws FileNotFoundException {
            
        File f = new File(fileName);
        Scanner s = new Scanner(f);
        String line = s.nextLine( );
        String[ ] inputs = line.split(",");
        int len = inputs.length;
        int[ ] values = new int[len];
        for (int i = 0; i < len; i++) {
            values[i] = Integer.parseInt(inputs[i]);
        }
        return values;
    }
}

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