question archive Many programs written with inheritance could be written with composition instead, and vice versa
Many programs written with inheritance could be written with composition instead, and vice versa
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Many programs written with inheritance could be written with composition instead, and vice versa. Rewrite class Base Plus Commission Employee (Fig. 9.11) of the Commission Employee-Base Plus Commission Employee hierarchy to use composition rather than inheritance.
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public class BasePlusCommissionEmployee
{
private CommissionEmployee commissionEmployee; // composition
private double baseSalary; // base salary per week
// six-argument constructor
public BasePlusCommissionEmployee( String first, String last,
String ssn, double sales, double rate, double salary)
{
commissionEmployee =
new CommissionEmployee( first, last, ssn, sales, rate );
setBaseSalary( salary ); // validate and store base salary
} // end six-argument BasePlusCommissionEmployee constructor
// set first name
public void setFirstName( String first )
{
commissionEmployee.setFirstName( first );
} // end method setFirstName
// return first name
public String getFirstName()
{
return commissionEmployee.getFirstName();
} // end method getFirstName
// set last name
public void setLastName( String last )
{
commissionEmployee.setLastName( last );
} // end method setLastName
// return last name
public String getLastName()
{
return commissionEmployee.getLastName();
} // end method getLastName
// set social security number
public void setSocialSecurityNumber( String ssn )
{
commissionEmployee.setSocialSecurityNumber( ssn );
} // end method setSocialSecurityNumber
// return social security number
public String getSocialSecurityNumber()
{
return commissionEmployee.getSocialSecurityNumber();
} // end method getSocialSecurityNumber
// set commission employee's gross sales amount
public void setGrossSales( double sales )
{
commissionEmployee.setGrossSales( sales );
} // end method setGrossSales
// return commission employee's gross sales amount
public double getGrossSales()
{
return commissionEmployee.getGrossSales();
} // end method getGrossSales
// set commission employee's rate
public void setCommissionRate( double rate )
{
commissionEmployee.setCommissionRate( rate );
} // end method setCommissionRate
// return commission employee's rate
public double getCommissionRate()
{
return commissionEmployee.getCommissionRate();
} // end method getCommissionRate
// set base-salaried commission employee's base salary
public void setBaseSalary( double salary )
{
baseSalary = ( salary
} // end method setBaseSalary
// return base-salaried commission employee's base salary
public double getBaseSalary()
{
return baseSalary;
} // end method getBaseSalary
// calculate base-salaried commission employee's earnings
public double earnings()
{
return getBaseSalary() + commissionEmployee.earnings();
} // end method earnings
// return String representation of BasePlusCommissionEmployee
@Override
public String toString()
{
return String.format( "%s %s\n%s: %.2f", "base-salaried",
commissionEmployee.toString(), "base salary", getBaseSalary() );
} // end method toString
} // end class BasePlusCommissionEmployee
