Chapter 5, Problem 9E

Explanation of Solution

a.

Method heading for each method:

• • Method heading for read rating from user is “public void readRating()”.
• • Method heading for gets maximum rating is “public int getMaximumRating()”...

Explanation of Solution

b.

Preconditions and postconditions of each method:

• • Precondition and postcondition of “public void readRating()” method.
  • ○ Precondition: Display maximum rating range for given description using object of “RatingScore” class.
  • ○ Postcondition: The “the_rating” is assigned to “value”.
• • Precondition and postcondition of “getMaximumRating()” method.
  • ○ Precondition: None...

Explanation of Solution

c.

Test class for some Java statement:

//Create object "movieScore" from "RatingScore" class

RatingScore movieScore = new RatingScore();

//Create object "restaurantScore" from "RatingScore" class

RatingScore restaurantScore = new RatingScore();

//Call "setRatingScore" method for object "movieScore"

movieScore.setRatingScore("Merry's excellent movie", 8);

//Call "setRatingScore" method for object "restaurantScore"

restaurantScore.setRatingScore("Food quality", 20);

//Read rating for object "movieScore" by calling the method "readRating".

movieScore.readRating();

//Display the given statement

System...

Explanation of Solution

d.

Implementation of class:

RatingScore.java:

//Import package

import java.util.Scanner;

//Define a class "RatingScore"

public class RatingScore

{

    //Declare required instance variable

    private String desc;

    private int maximum_rating;

    private int the_rating;

    //Set values to "RatingScore" attributes

    public void setRatingScore(String d, int m)

    {

        desc = d;

        maximum_rating = m;

        the_rating = -1;

    }

    //Method definition for read rating from user

    public void readRating()

    {

        //Display given statement for description

System.out.println("Enter rating for " + desc + ":");

        //Display given maximum rating

System.out.println("Please enter an integer from 0 to " + maximum_rating);

        //Create object for Scanner class

        Scanner r = new Scanner(System.in);

        //Assign "value" to "-1"

        int value = -1;

        //Assign required rating to "true"

        boolean requiredRating = true;

        //Check rating condition using "while" loop

        while(requiredRating)

        {

            //Read input from user

            value = r.nextInt();

if(value >= 0 && value <= maximum_rating)

            {

                requiredRating = false;

            }

            else

            {

System.out.println("Error: The given rating is out of range.");

System.out.println("Enter an integer from 0 to " + maximum_rating);

            }

        }      

        the_rating = value;

    }

    //Method definition for gets maximum rating

    public int getMaximumRating()

    {

        //Returns maximum rating

        return maximum_rating;

    }

    //Method definition for gets rating

    public int getRatingValue()

    {