Pages

Wednesday, 14 December 2016

Chapter 12 Exercise 23, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

12.23 (Process scores in a text file on the Web)
Suppose that the text file on the Web
    http://cs.armstrong.edu/liang/data/Scores.txt
contains an unspecified number of scores.
Write a program that reads the scores from the file and displays
their total and average. Scores are separated by blanks.


import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Scanner;

public class Exercise_23 {

    public static void main(String[] args) {

        ArrayList<Integer> scores = new ArrayList<>();
        try {
            URL url = new URL("http://cs.armstrong.edu/liang/data/Scores.txt");
            Scanner input = new Scanner(url.openStream());
            while (input.hasNextInt()) {

                scores.add(input.nextInt());
            }

        } catch (IOException e) {
            e.printStackTrace();
            System.exit(0);
        }

        System.out.println("Scores = " + scores);
        System.out.println("Total = " + getTotal(scores));
        System.out.println("Average = " + getAverage(scores));

    }

    private static double getAverage(ArrayList<Integer> scores) {

        double total = getTotal(scores);

        return total / scores.size();
    }

    private static int getTotal(ArrayList<Integer> scores) {

        int total = 0;
        for (int score : scores) {
            total += score;
        }

        return total;
    }
}

No comments :

Post a Comment