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‎09.03-UsingCompositionRatherInheritance/BasePlusCommissionEmployee.java‎

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// Fig. 9.11: BasePlusCommissionEmployee.java
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// BasePlusCommissionEmployee class inherits from CommissionEmployee
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// and accesses the superclass�s private data via inherited
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// public methods.
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public class BasePlusCommissionEmployee
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{
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private CommissionEmployee CE;
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private double baseSalary; // base salary per week
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// six-argument constructor
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public BasePlusCommissionEmployee(String firstName, String lastName,
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String socialSecurityNumber, double grossSales,
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double commissionRate, double baseSalary)
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{
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CE = new CommissionEmployee(firstName, lastName, socialSecurityNumber,
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grossSales, commissionRate);
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// if baseSalary is invalid throw exception
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if (baseSalary < 0.0)
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throw new IllegalArgumentException(
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"Base salary must be >= 0.0");
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this.baseSalary = baseSalary;
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}
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// get first name
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public String getFirstName(){
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return CE.getFirstName();
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}
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// get last name
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public String getLastName(){
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return CE.getLastName();
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}
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// get social security number
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public String getSocialSecurityNumber()
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{
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return CE.getSocialSecurityNumber();
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}
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//set gross sales
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public void setGrossSales(double grossSales)
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{
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CE.setGrossSales(grossSales);
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}
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// get gross sales
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public double getGrossSales()
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{
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return CE.getGrossSales();
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}
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// set commission rate
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public void setCommissionRate(double commissionRate)
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{
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CE.setCommissionRate(commissionRate);
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}
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// get commision rate
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public double getCommissionRate()
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{
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return CE.getCommissionRate();
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}
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// set base salary
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public void setBaseSalary(double baseSalary)
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{
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if (baseSalary < 0.0)
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throw new IllegalArgumentException(
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"Base salary must be >= 0.0");
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this.baseSalary = baseSalary;
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}
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// return base salary
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public double getBaseSalary()
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{
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return baseSalary;
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}
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// calculate earnings
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public double earnings()
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{
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return getBaseSalary() + CE.earnings();
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}
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// return String representation of BasePlusCommissionEmployee
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public String toString()
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{
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return String.format("%s %s%n%s: %.2f", "base-salaried",
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CE.toString(), "base salary", getBaseSalary());
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}
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} // end class BasePlusCommissionEmployee
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/**************************************************************************
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* (C) Copyright 1992-2014 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
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* development, research, and testing of the theories and programs *
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* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
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* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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*************************************************************************/

‎09.03-UsingCompositionRatherInheritance/CommissionEmployee.java‎

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// Fig. 9.10: CommissionEmployee.java
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// CommissionEmployee class uses methods to manipulate its
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// private instance variables.
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public class CommissionEmployee
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{
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private final String firstName;
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private final String lastName;
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private final String socialSecurityNumber;
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private double grossSales; // gross weekly sales
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private double commissionRate; // commission percentage
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// five-argument constructor
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public CommissionEmployee(String firstName, String lastName,
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String socialSecurityNumber, double grossSales,
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double commissionRate)
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{
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// implicit call to Object constructor occurs here
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// if grossSales is invalid throw exception
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if (grossSales < 0.0)
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throw new IllegalArgumentException(
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"Gross sales must be >= 0.0");
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// if commissionRate is invalid throw exception
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if (commissionRate <= 0.0 || commissionRate >= 1.0)
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throw new IllegalArgumentException(
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"Commission rate must be > 0.0 and < 1.0");
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this.firstName = firstName;
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this.lastName = lastName;
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this.socialSecurityNumber = socialSecurityNumber;
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this.grossSales = grossSales;
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this.commissionRate = commissionRate;
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} // end constructor
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// return first name
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public String getFirstName()
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{
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return firstName;
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}
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// return last name
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public String getLastName()
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{
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return lastName;
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}
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// return social security number
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public String getSocialSecurityNumber()
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{
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return socialSecurityNumber;
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}
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// set gross sales amount
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public void setGrossSales(double grossSales)
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{
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if (grossSales < 0.0)
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throw new IllegalArgumentException(
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"Gross sales must be >= 0.0");
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this.grossSales = grossSales;
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}
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// return gross sales amount
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public double getGrossSales()
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{
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return grossSales;
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}
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// set commission rate
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public void setCommissionRate(double commissionRate)
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{
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if (commissionRate <= 0.0 || commissionRate >= 1.0)
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throw new IllegalArgumentException(
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"Commission rate must be > 0.0 and < 1.0");
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this.commissionRate = commissionRate;
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}
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// return commission rate
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public double getCommissionRate()
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{
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return commissionRate;
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}
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// calculate earnings
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public double earnings()
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{
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return getCommissionRate() * getGrossSales();
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}
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// return String representation of CommissionEmployee object
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@Override
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public String toString()
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{
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return String.format("%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f",
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"commission employee", getFirstName(), getLastName(),
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"social security number", getSocialSecurityNumber(),
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"gross sales", getGrossSales(),
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"commission rate", getCommissionRate());
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}
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} // end class CommissionEmployee
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/**************************************************************************
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* (C) Copyright 1992-2014 by Deitel & Associates, Inc. and *
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* Pearson Education, Inc. All Rights Reserved. *
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* *
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* DISCLAIMER: The authors and publisher of this book have used their *
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* best efforts in preparing the book. These efforts include the *
111+
* development, research, and testing of the theories and programs *
112+
* to determine their effectiveness. The authors and publisher make *
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* no warranty of any kind, expressed or implied, with regard to these *
114+
* programs or to the documentation contained in these books. The authors *
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* and publisher shall not be liable in any event for incidental or *
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* consequential damages in connection with, or arising out of, the *
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* furnishing, performance, or use of these programs. *
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*************************************************************************/

‎09.03-UsingCompositionRatherInheritance/Main.java‎

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public class Main
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{
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public static void main(String[] args)
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{
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// instantiate BasePlusCommissionEmployee object
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BasePlusCommissionEmployee employee =
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new BasePlusCommissionEmployee(
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"Bob", "Lewis", "333-33-3333", 5000, .04, 300);
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// get base-salaried commission employee data
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System.out.println(
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"Employee information obtained by get methods:");
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System.out.printf("%n%s %s%n", "First name is",
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employee.getFirstName());
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System.out.printf("%s %s%n", "Last name is",
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employee.getLastName());
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System.out.printf("%s %s%n", "Social security number is",
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employee.getSocialSecurityNumber());
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System.out.printf("%s %.2f%n", "Gross sales is",
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employee.getGrossSales());
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System.out.printf("%s %.2f%n", "Commission rate is",
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employee.getCommissionRate());
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System.out.printf("%s %.2f%n", "Base salary is",
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employee.getBaseSalary());
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employee.setBaseSalary(1000);
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System.out.printf("%n%s:%n%n%s%n",
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"Updated employee information obtained by toString",
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employee.toString());
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} // end main
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} // end class

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