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9.3 (Recommended: Using Composition Rather Than Inheritance) Many programs written with inheritance could be written with composition instead, and vice versa. Rewrite class BasePlusCommissionEmployee (Fig. 9.11) of the CommissionEmployee—BasePlusCommissionEmployee hierarchy so  that it contains a reference to a ConmissionEmployee object, rather than inheriting from class CommissionEmployee. Retest BasePlusConmissionEmployee to demonstrate that it still provides the same functionality.

9.3 (Recommended: Using Composition Rather Than Inheritance) Many programs written with inheritance could be written with composition instead, and vice versa. Rewrite class BasePlusCommissionEmployee (Fig. 9.11) of the CommissionEmployee—BasePlusCommissionEmployee hierarchy so  that it contains a reference to a ConmissionEmployee object, rather than inheriting from class CommissionEmployee. Retest BasePlusConmissionEmployee to demonstrate that it still provides the same functionality.

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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9.3 (Recommended: Using Composition Rather Than Inheritance) Many programs written with inheritance could be written with composition instead, and vice versa. Rewrite class BasePlusCommissionEmployee (Fig. 9.11) of the CommissionEmployee—BasePlusCommissionEmployee hierarchy so  that it contains a reference to a ConmissionEmployee object, rather than inheriting from class CommissionEmployee. Retest BasePlusConmissionEmployee to demonstrate that it still provides the same functionality.

I // Fig. 9.11: BasePlusCommission Employee.java 2 // BasePlus Commission Employee class inherits from Commission Employee 3 // and accesses the superclass's private data via inherited 4 // public methods. 5 public class BasePlusCommission Employee extends Commission Employee { 6 private double baseSalary; // base salary per week 7 Fig. 9.11 | BasePlus Commission Employee class inherits from Commission Employee and accesses the superclass's private data via inherited public methods. (Part 1 of 2.)
Transcribed Image Text:I // Fig. 9.11: BasePlusCommission Employee.java 2 // BasePlus Commission Employee class inherits from Commission Employee 3 // and accesses the superclass's private data via inherited 4 // public methods. 5 public class BasePlusCommission Employee extends Commission Employee { 6 private double baseSalary; // base salary per week 7 Fig. 9.11 | BasePlus Commission Employee class inherits from Commission Employee and accesses the superclass's private data via inherited public methods. (Part 1 of 2.)
8 9 10 || 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 } // six-argument constructor public BasePlusCommission Employee (String firstName, String lastName, String social SecurityNumber, double grossSales, double commission Rate, double baseSalary) { super (firstName, lastName, social SecurityNumber, grossSales, commission Rate); // if baseSalary is invalid throw exception if (baseSalary < 0.0) { throw new IllegalArgumentException ("Base salary must be >= 0.0"); } this.baseSalary = baseSalary: } // set base salary public void setBase Salary(double baseSalary) { if (baseSalary < 0.0) { throw new IllegalArgumentException ("Base salary must be >= 0.0"); } this.baseSalary = baseSalary; } // return base salary public double getBaseSalary() {return baseSalary;} // calculate earnings @Override public double earnings() {return getBaseSalary() + super. earnings ((); } } // return String representation of BasePlusCommission Employee @Override public String toString() { return String.format("%s %s %n%s: %.2f", "base-salaried", super.toString(), "base salary", getBaseSalary()); Fig. 9.11 | BasePlusCommission Employee class inherits from Commission Employee and accesses the superclass's private data via inherited public methods. (Part 2 of 2.)
Transcribed Image Text:8 9 10 || 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 } // six-argument constructor public BasePlusCommission Employee (String firstName, String lastName, String social SecurityNumber, double grossSales, double commission Rate, double baseSalary) { super (firstName, lastName, social SecurityNumber, grossSales, commission Rate); // if baseSalary is invalid throw exception if (baseSalary < 0.0) { throw new IllegalArgumentException ("Base salary must be >= 0.0"); } this.baseSalary = baseSalary: } // set base salary public void setBase Salary(double baseSalary) { if (baseSalary < 0.0) { throw new IllegalArgumentException ("Base salary must be >= 0.0"); } this.baseSalary = baseSalary; } // return base salary public double getBaseSalary() {return baseSalary;} // calculate earnings @Override public double earnings() {return getBaseSalary() + super. earnings ((); } } // return String representation of BasePlusCommission Employee @Override public String toString() { return String.format("%s %s %n%s: %.2f", "base-salaried", super.toString(), "base salary", getBaseSalary()); Fig. 9.11 | BasePlusCommission Employee class inherits from Commission Employee and accesses the superclass's private data via inherited public methods. (Part 2 of 2.)
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