CommissionEmployee.java


public class CommissionEmployee {
    private final String firstName;
    private final String lastName;
    private final String socialSecurityNumber;
    private double grossSales;
    private double commissionRate;

    // Constructor
    public CommissionEmployee(String firstName, String lastName,
                              String socialSecurityNumber, double grossSales,
                              double commissionRate) {
        if (grossSales < 0.0) {
            throw new IllegalArgumentException("Gross sales must be >= 0.0");
        }

        if (commissionRate <= 0.0 || commissionRate >= 1.0) {
            throw new IllegalArgumentException(
                "Commission rate must be > 0.0 and < 1.0");
        }

        this.firstName = firstName;
        this.lastName = lastName;
        this.socialSecurityNumber = socialSecurityNumber;
        this.grossSales = grossSales;
        this.commissionRate = commissionRate;
    }

    public String getFirstName() {
        return firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public String getSocialSecurityNumber() {
        return socialSecurityNumber;
    }

    public void setGrossSales(double grossSales) {
        if (grossSales < 0.0) {
            throw new IllegalArgumentException("Gross sales must be >= 0.0");
        }
        this.grossSales = grossSales;
    }

    public double getGrossSales() {
        return grossSales;
    }

    public void setCommissionRate(double commissionRate) {
        if (commissionRate <= 0.0 || commissionRate >= 1.0) {
            throw new IllegalArgumentException(
                "Commission rate must be > 0.0 and < 1.0");
        }
        this.commissionRate = commissionRate;
    }

    public double getCommissionRate() {
        return commissionRate;
    }

    public double earnings() {
        return commissionRate * grossSales;
    }

    @Override
    public String toString() {
        return String.format("%s: %s %s%n%s: %s%n%s: %.2f%n%s: %.2f",
            "commission employee", firstName, lastName,
            "social security number", socialSecurityNumber,
            "gross sales", grossSales,
            "commission rate", commissionRate);
    }
}








CommissionEmployeeTest.java













public class CommissionEmployeeTest {
    public static void main(String[] args) {
      
        CommissionEmployee employee = new CommissionEmployee(
            "Sue", "Jones", "222-22-2222", 10000, .06);

        System.out.println("Employee information obtained by get methods:");
        System.out.printf("%n%s %s%n", "First name is", employee.getFirstName());
        System.out.printf("%s %s%n", "Last name is", employee.getLastName());
        System.out.printf("%s %s%n", "Social security number is", employee.getSocialSecurityNumber());
        System.out.printf("%s %.2f%n", "Gross sales is", employee.getGrossSales());
        System.out.printf("%s %.2f%n", "Commission rate is", employee.getCommissionRate());

        employee.setGrossSales(5000);
        employee.setCommissionRate(.1);

        System.out.printf("%n%s:%n%n%s%n",
            "Updated employee information obtained by toString", employee);
    }
}