Question

First, launch NetBeans and close any previous projects that may be open (at the top menu go to File ==> Close All Projects).

Then create a new Java application called "MultiDimensions" (without the quotation marks) that declares a two-dimensional array of doubles (call it scores) with three rows and three columns and that uses methods and loops as follows.

Use a method containing a nested while loop to get the nine (3 x 3) doubles from the user at the command line.

Use a method containing a nested for loop to compute the average of the doubles in each row.

Use a method to output these three row averages to the command line.

Be sure to comment each method appropriately.

Answer 1

Here is the completed code for this problem. Comments are included, go through it, learn how things work and let me know if you have any doubts or if you need anything to change. If you are satisfied with the solution, please rate the answer. Thanks

// MultiDimensions.java

import java.util.Scanner;

public class MultiDimensions {

      // method to read and fill a 2d array

      static void readArray(double array[][]) {

            // scanner to read input

            Scanner scanner = new Scanner(System.in);

            // looping through each row

            for (int i = 0; i < array.length; i++) {

                  // looping through each column

                  for (int j = 0; j < array[i].length; j++) {

                        // asking for a value, reading it to current position

                        System.out.printf("Enter a value for row %d column %d: ", i, j);

                        array[i][j] = scanner.nextDouble();

                  }

            }

      }

      // method to calculate and return an array containing averages of each row

      // in 2d array

      static double[] rowAverages(double array[][]) {

            // creating an array big enough to store averages of all rows

            double avgs[] = new double[array.length];

            // looping through each row

            for (int i = 0; i < array.length; i++) {

                  // initializing sum to 0

                  double sum = 0;

                  // looping through each column

                  for (int j = 0; j < array[i].length; j++) {

                        // summing values

                        sum += array[i][j];

                  }

                  // finding average, adding to avgs array

                  avgs[i] = (double) sum / array[i].length;

            }

            return avgs;

      }

      // method to output row averages into the console window

      static void outputRowAverages(double avgs[]) {

            // looping through each value and printing it. formatting average to 3

            // decimal digits

            for (int i = 0; i < avgs.length; i++) {

                  System.out.printf("Average of row %d is %.3f\n", i, avgs[i]);

            }

      }

      public static void main(String[] args) {

            // creating a 3x3 double array

            double array[][] = new double[3][3];

            // reading, filling values

            readArray(array);

            // finding row averages

            double avgs[] = rowAverages(array);

            // displaying row averages

            outputRowAverages(avgs);

      }

}

/*OUTPUT*/

Enter a value for row 0 column 0: 1

Enter a value for row 0 column 1: 2

Enter a value for row 0 column 2: 3

Enter a value for row 1 column 0: 4

Enter a value for row 1 column 1: 5

Enter a value for row 1 column 2: 6

Enter a value for row 2 column 0: 7

Enter a value for row 2 column 1: 8

Enter a value for row 2 column 2: 9

Average of row 0 is 2.000

Average of row 1 is 5.000

Average of row 2 is 8.000

Answer 2

As an AI language model, I don't have direct access to your computer to launch NetBeans or interact with its graphical interface. However, I can provide you with the Java code to create the "MultiDimensions" application as described. You can then copy and paste this code into a new Java project in NetBeans.

Here's the Java code for the "MultiDimensions" application:

javaCopy codeimport java.util.Scanner;public class MultiDimensions {    public static void main(String[] args) {        // Create a two-dimensional array of doubles with three rows and three columns
        double[][] scores = new double[3][3];        // Call the method to get the nine doubles from the user
        getDoublesFromUser(scores);        // Call the method to compute the average of the doubles in each row
        double[] rowAverages = computeRowAverages(scores);        // Call the method to output the row averages to the command line
        outputRowAverages(rowAverages);
    }    // Method to get the nine doubles from the user at the command line
    public static void getDoublesFromUser(double[][] scores) {        Scanner scanner = new Scanner(System.in);
        System.out.println("Enter nine doubles for the 3x3 array:");        for (int i = 0; i < 3; i++) {            for (int j = 0; j < 3; j++) {
                scores[i][j] = scanner.nextDouble();
            }
        }
        scanner.close();
    }    // Method to compute the average of the doubles in each row
    public static double[] computeRowAverages(double[][] scores) {        double[] rowAverages = new double[3];        for (int i = 0; i < 3; i++) {            double sum = 0;            for (int j = 0; j < 3; j++) {
                sum += scores[i][j];
            }
            rowAverages[i] = sum / 3;
        }        return rowAverages;
    }    // Method to output the row averages to the command line
    public static void outputRowAverages(double[] rowAverages) {
        System.out.println("Row Averages:");        for (int i = 0; i < 3; i++) {
            System.out.println("Row " + (i + 1) + ": " + rowAverages[i]);
        }
    }
}

To create the "MultiDimensions" Java application in NetBeans, follow these steps:

1. Launch NetBeans.

2. Click on "File" in the top menu, then choose "New Project..."

3. In the "New Project" dialog, select "Java" in the "Categories" list, and "Java Application" in the "Projects" list. Click "Next."

4. Enter "MultiDimensions" as the project name and choose the desired project location. Click "Finish."

5. In the "Projects" tab on the left, right-click on the "MultiDimensions" project and choose "New" > "Java Class."

6. Name the class "MultiDimensions" and make sure the "Main Class" checkbox is checked. Click "Finish."

7. Replace the default code in the "MultiDimensions" class with the code provided above.

8. Save the file (Ctrl + S or Command + S).

9. Run the program by clicking the green "Play" button (or press Shift + F6).

Now, you should be able to enter nine doubles at the command line when prompted, and the program will compute and output the row averages for the 3x3 array.