Question

I am struggling with this java code

ublic class HW2_Q4 {

   public static void main(String[] args) {

       // Define the input string. Note that I could have written it all on a
       // single line, but I broke it up to match the question.
       String input = "Book , Cost , Number\n"
                   + "Hamlet , 24.95 , 10\n"
                   + "King Lear , 18.42 , 13\n";
      
       // Construct a Scanner, but have it read the String defined above,
       // rather than System.in. Note that I'm leaving the name of the
       // variable as "keyboard" so that it matches the question.
       Scanner keyboard = new Scanner(input);
      
       // Declare and initialize variables to store the total cost and number.
       double totalCost = 0;
       int totalNumber = 0;

       // Write your code below using only these variables. Your code
       // should not contain literal values. For instance, do not calculate
       // the total cost with the statement "totalCost = 24.95 + 18.42".
       // Instead, use the Scanner to read the values from the keyboard.

Answer 1

import java.util.Scanner;

public class HW2_Q4 {

    public static void main(String[] args) {
        // Define the input string. Note that I could have written it all on a
        // single line, but I broke it up to match the question.
        String input = "Book , Cost , Number\n"
                + "Hamlet , 24.95 , 10\n"
                + "King Lear , 18.42 , 13\n";

        // Construct a Scanner, but have it read the String defined above,
        // rather than System.in. Note that I'm leaving the name of the
        // variable as "keyboard" so that it matches the question.
        Scanner keyboard = new Scanner(input);

        // Declare and initialize variables to store the total cost and number.
        double totalCost = 0;
        int totalNumber = 0;

        // Write your code below using only these variables. Your code
        // should not contain literal values. For instance, do not calculate
        // the total cost with the statement "totalCost = 24.95 + 18.42".
        // Instead, use the Scanner to read the values from the keyboard.
        String line, words[];
        keyboard.nextLine();    // read header line
        while (keyboard.hasNextLine()) {
            line = keyboard.nextLine();
            words = line.split(",");
            totalCost += Double.parseDouble(words[1].trim());
            totalNumber += Integer.parseInt(words[2].trim());
        }
        System.out.println(totalCost);
        System.out.println(totalNumber);
    }
}