Problem Statement:Students have taken different tests and have scores points that are recorded inGradebook.txtfile as shown in Fig. 1. Note that students may have taken different number of tests.

A program that prints students' names and their average scores as shown in Fig. 2.

Zhang: 10, 9, 10, 5, 9 Liu: 9, 10, 10 Smith: 8, 10, 10, 7, 9 Chomsky: 9, 10, 10, 8 Sharma: 10, 9, 6, 9, 8 Fig. 1: Gradebook.txt

Student Average Score ---------------------------------------- Zhang : 8.60 Liu : 9.67 Smith : 8.80 Chomsky : 9.25 Sharma : 8.40 Fig.2: Console output

Solution Design:

You are given a class named Gradebook.java. The main() and printAverages() methods have been fully coded. You need to code the other four methods. Please refer to the comments in the code file provided for more details.

Instructions

Gradebook.java

package exam1;

 

import java.util.Arrays;

 

public class Gradebook {

 

    String[] fileData; //stores rows of data read from data file

    String[] students;  //names of students

    float[][] scores;   //students' scores in the same order as given in data file

    float[] averageScores; //each students' average score

 

    //do not change this method

    public static void main(String[] args) {

        Gradebook gradebook = new Gradebook();

        gradebook.fileData = gradebook.loadData("Gradebook.txt");

        gradebook.students = gradebook.getStudents();

        gradebook.scores = gradebook.getScores();

        gradebook.averageScores = gradebook.getAverages();

        gradebook.printAverages();

    }

 

    /** loadData() uses filename to read the file and

     * returns an array of String, with each

     * string representing one row in data file

     * @param filename

     * @return

     */

    String[] loadData(String filename) {

        // code here

        return null;

 

    }

 

    /** getStudents() uses data in fileData array

     * and extracts student's names from it. It returns

     * an array of these names.

     * @return

     */

    String[] getStudents() {

        //code here

        return null;

    }

 

    /** getScores uses data stored in fileData array

     * and extracts scores of each student in a 2D array of

     * float numbers.

     * It returns the 2D array.

     * @return

     */

    float[][] getScores() {

        // code here

        return null;

    }

 

    /** getAverages uses data stored in score[][] array

     * and computes average score for each student.

     * It returns an array of these averages.

     * @return

     */

    float[] getAverages() {

        // code here

        return null;

    }

 

    //do not change this method

    void printAverages() {

        System.out.printf("%-20s\t%s%n", "Student", "Average Score");

        System.out.println("----------------------------------------");

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

            System.out.printf("%-20s:\t%10.2f\n", students[i] , averageScores[i] );

        }

    }

}

Gradebook.txt 

 

Zhang: 10, 9, 10, 5, 9
Liu: 9, 10, 10
Smith: 8, 10, 10, 7, 9
Chomsky: 9, 10, 10, 8
Sharma: 10, 9, 6, 9, 8

Copy/import java files in package named exam1 and data file in the project folder.
Complete your code as needed

Transcribed Image Text:

Gradebook fileData: String[] students: String[] scores: float[][] averageScores: float[] main(args: String[]): void printAverages (): void loadData(filename: String): String[] getStudents(): String[] getScores(): float[][] getAverages(): float[] Gradebook fileData: String[] students: String[] scores: float[][] averageScores: float[] main(args: String[]): void printAverages (): void loadData(filename: String): String[] getStudents(): String[] getScores(): float[][] getAverages(): float[]