Java: An Introduction to Problem Solving and Programming (7th Edition)
Java: An Introduction to Problem Solving and Programming (7th Edition)
7th Edition
ISBN: 9780133766264
Author: Walter Savitch
Publisher: PEARSON
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Chapter 8, Problem 13E

Explanation of Solution

 Implementation of the derived class “CombinedDiscount”:

 The implementation of the “CombinedDiscount” class derived from the “DiscountPolicy” abstract class is given below:

  • • Declare the “p1”, and “p2” variables.
  • • Define the constructor.
    • ○ Set the values to the declared variables.
  • • Define the “computeDiscount” method.
    • ○ Declare the required variables.
    • ○ Call the “computeDiscount” method with different variables.
    • ○ Return the maximum value by checking “discount1” and “discount2” values. 
  • • Define the main method.
    • ○ Create the objects for the “CombinedDiscount”, “BuyNItemsGetOneFree”, and “BulkDiscount” classes.
    • ○ The “for” loop through 1 to10 numbers.
      • ■ Call the “computeDiscount” method with objects and display the output.

 The implementation of the “BulkDiscount” class derived from the “DiscountPolicy” abstract class is given below:

  • • Declare the “min”, and “percentOff” variables.
  • • Define the constructor.
    • ○ Set the values to the declared variables.
  • • Define the “computeDiscount” method.
    • ○ If the purchase count is less than minimum, then calculate the “discount” value.
    • ○ Otherwise make “discount” as 0.
  • • Finally return the “discount” value.
  • • Define the main method.
    • ○ Create an object for the “BulkDiscount” class.
    • ○ Call the “computeDiscount” method with different parameters and display the output.

 The implementation of the “BuyNItemsGetOneFree” class derived from the “DiscountPolicy” abstract class is given below:

  • • Declare the “x” variable.
  • • Define the constructor.
    • ○ Set the values to the declared variable.
  • • Define the “computeDiscount” method.
    • ○ Declare the required variables.
    • ○ Calculate the “a” and “discount” values.
    • ○ Return the “discount” value.
  • • Define the main method.
    • ○ Create an object for the “BuyNItemsGetOneFree” class.
    • ○ The “for” loop through 1 to10 numbers.
      • ■ Call the “computeDiscount” method with the parameter and display the output.

The creation of the abstract class “DiscountPolicy” is given below:

  • • Declare the abstract method “computeDiscount” along with the two parameters “count” and “itemCost”.
    • ○ This method compute and return the discount for the purchase of a given number of single item.

 Program:

 Filename: CombinedDiscount.java

//definition of "CombinedDiscount" class

public class CombinedDiscount extends DiscountPolicy

{

    //declare the required variables 

    private DiscountPolicy p1;

    private DiscountPolicy p2;

    //definition of constructor

public CombinedDiscount(DiscountPolicy first, DiscountPolicy second )

    {

        //set the values

        p1 = first;

        p2 = second;

    }

    //definition of "computeDiscount" method

public double computeDiscount(int count, double itemCost)

    {

        //declare the required variables

        double discount1;

        double discount2;

        //call the methods with different variables

discount1 = p1.computeDiscount(count, itemCost);

discount2 = p2.computeDiscount(count, itemCost);

        //check the condition

        if(discount1 > discount2)

            //return the value

            return discount1;

        //otherwise

        else

            //return the value

            return discount2;

    }

    //definition of main method

    public static void main(String[] args)

    {

        //create the objects for the classes

DiscountPolicy buy = new BuyNItemsGetOneFree(3);

DiscountPolicy bulk = new BulkDiscount(5, 30...

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Chapter 8 Solutions

Java: An Introduction to Problem Solving and Programming (7th Edition)

Ch. 8.2 - Rewrite the definition of the method reset for the...Ch. 8.2 - Can an object be referenced by variables of...Ch. 8.2 - What is the type or types of the variable(s) that...Ch. 8.2 - Prob. 14STQCh. 8.2 - Prob. 15STQCh. 8.2 - Consider the code below, which was discussed in...Ch. 8.2 - Prob. 17STQCh. 8.3 - Prob. 18STQCh. 8.3 - Prob. 19STQCh. 8.3 - Is overloading a method name an example of...Ch. 8.3 - In the following code, will the two invocations of...Ch. 8.3 - In the following code, which definition of...Ch. 8.4 - Prob. 23STQCh. 8.4 - Prob. 24STQCh. 8.4 - Prob. 25STQCh. 8.4 - Prob. 26STQCh. 8.4 - Prob. 27STQCh. 8.4 - Prob. 28STQCh. 8.4 - Are the two definitions of the constructors given...Ch. 8.4 - The private method skipSpaces appears in the...Ch. 8.4 - Describe the implementation of the method drawHere...Ch. 8.4 - Is the following valid if ShapeBaSe is defined as...Ch. 8.4 - Prob. 33STQCh. 8.5 - Prob. 34STQCh. 8.5 - What is the difference between what you can do in...Ch. 8.5 - Prob. 36STQCh. 8 - Consider a program that will keep track of the...Ch. 8 - Implement your base class for the hierarchy from...Ch. 8 - Draw a hierarchy for the components you might find...Ch. 8 - Suppose we want to implement a drawing program...Ch. 8 - Create a class Square derived from DrawableShape,...Ch. 8 - Create a class SchoolKid that is the base class...Ch. 8 - Derive a class ExaggeratingKid from SchoolKid, as...Ch. 8 - Create an abstract class PayCalculator that has an...Ch. 8 - Derive a class RegularPay from PayCalculator, as...Ch. 8 - Create an abstract class DiscountPolicy. It should...Ch. 8 - Derive a class BulkDiscount from DiscountPolicy,...Ch. 8 - Derive a class BuyNItemsGetOneFree from...Ch. 8 - Prob. 13ECh. 8 - Prob. 14ECh. 8 - Create an interface MessageEncoder that has a...Ch. 8 - Create a class SubstitutionCipher that implements...Ch. 8 - Create a class ShuffleCipher that implements the...Ch. 8 - Define a class named Employee whose objects are...Ch. 8 - Define a class named Doctor whose objects are...Ch. 8 - Create a base class called Vehicle that has the...Ch. 8 - Create a new class called Dog that is derived from...Ch. 8 - Define a class called Diamond that is derived from...Ch. 8 - Prob. 2PPCh. 8 - Prob. 3PPCh. 8 - Prob. 4PPCh. 8 - Create an interface MessageDecoder that has a...Ch. 8 - For this Programming Project, start with...Ch. 8 - Modify the Student class in Listing 8.2 so that it...Ch. 8 - Prob. 8PPCh. 8 - Prob. 9PPCh. 8 - Prob. 10PP
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