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Guest_R3.RyozKidz_*
First code:
public class CommissionEmployee3
{
private String firstName;
private String lastName;
private String socialSecurityNumber;
private double grossSales;
private double commissionRate;
public CommissionEmployee3(String first , String last , String ssn , double sales , double rate)
{
firstName = first;
lastName = last;
socialSecurityNumber = ssn;
setGrossSales(sales);
setCommissionRate(rate);
}
public void setFirstName(String first)
{
firstName = first;
}
public String getFirstName()
{
return firstName;
}
public void setLastName(String last)
{
lastName = last;
}
public String getLastName()
{
return lastName;
}
public void setSocialSecurityNumber(String ssn)
{
socialSecurityNumber = ssn;
}
public String getSocialSecurityNumber()
{
return socialSecurityNumber;
}
public void setGrossSales(double sales)
{
grossSales = (sales < 0.0) ? 0.0 : sales;
}
public double getGrossSales()
{
return grossSales;
}
public void setCommissionRate(double rate)
{
commissionRate = (rate > 0.0 && rate < 1.0) ? rate : 0.0;
}
public double getCommissionRate()
{
return commissionRate;
}
public double earnings()
{
return getCommissionRate() * getGrossSales();
}
public String toString()
{
return String.format("%s: %s %s\n%s: %s\n%s: %.2f\n%s: %.2f" , "commission employee" , getFirstName() , getLastName() , "social security number" , getSocialSecurityNumber() , "gross sales" , getGrossSales() , "commission rate" , getCommissionRate());
}
}
public class BasePlusCommissionEmployee4 extends CommissionEmployee3
{
private double baseSalary;
public BasePlusCommissionEmployee4(String first , String last , String ssn , double sales , double rate , double salary)
{
super(first ,last , ssn , sales , rate);
setBaseSalary(salary);
}
public void setBaseSalary(double salary)
{
baseSalary = (salary < 0.0) ? 0.0 : salary;
}
public double getBaseSalary()
{
return baseSalary;
}
public double earnings()
{
return getBaseSalary() + super.earnings();
}
public String toString()
{
return String.format("%s %s\n%s: %.2f" , "base-salaried" , super.toString() , "base salary" , getBaseSalary());
}
}
public class PolymorphismTest
{
public static void main(String args[])
{
CommissionEmployee3 commissionEmployee = new CommissionEmployee3("Sue" , "Jones" , "222-22-2222" , 10000 , .06);
BasePlusCommissionEmployee4 basePlusCommissionEmployee = new BasePlusCommissionEmployee4("Bob" , "Lewis" , "333-33-3333" , 5000 , .04 , 300);
System.out.printf("%s %s:\n\n%s\n\n" , "Call CommissionEmployee3's toString with superclass reference" , "to superclass object" , commissionEmployee.toString());
System.out.printf("%s %s:\n\n%s\n\n" , "Call BasePlusCommissionEmployee4's toString with sybclass" , "reference to subclass object" , basePlusCommissionEmployee.toString());
CommissionEmployee3 commissionEmployee2 = basePlusCommissionEmployee;
System.out.printf("%s %s:\n\n%s\n" , "Call BasePlusCommissionEmployee4's toString with superclass" , "reference to subclass object" , commissionEmployee2.toString());
}
}
Second code:
public abstract class Employee
{
private String firstName;
private String lastName;
private String socialSecurityNumber;
public Employee(String first , String last , String ssn)
{
firstName = first;
lastName = last;
socialSecurityNumber = ssn;
}
public void setFirstName(String first)
{
firstName = first;
}
public String getFirstName()
{
return firstName;
}
public void setLastName(String last)
{
lastName = last;
}
public String getLastName()
{
return lastName;
}
public void setSocialSecurityNumber(String ssn)
{
socialSecurityNumber = ssn;
}
public String getSocialSecurityNumber()
{
return socialSecurityNumber;
}
public String toString()
{
return String.format("%s %s\nsocial security number: %s" , getFirstName() , getLastName() , getSocialSecurityNumber());
}
public abstract double earnings();
}
public class SalariedEmployee extends Employee
{
private double weeklySalary;
public SalariedEmployee(String first , String last , String ssn , double salary)
{
super(first , last , ssn);
setWeeklySalary(salary);
}
public void setWeeklySalary(double salary)
{
weeklySalary = salary < 0.0 ? 0.0 : salary;
}
public double getWeeklySalary()
{
return weeklySalary;
}
public double earnings()
{
return getWeeklySalary();
}
public String toString()
{
return String.format("salaried employee: %s\n%s: $%,.2f" , super.toString() , "weekly salary" , getWeeklySalary());
}
}
public class HourlyEmployee extends Employee
{
private double wage;
private double hours;
public HourlyEmployee(String first , String last , String ssn , double hourlyWage , double hoursWorked)
{
super(first , last , ssn);
setWage(hourlyWage);
setHours(hoursWorked);
}
public void setWage(double hourlyWage)
{
wage = ( hourlyWage < 0.0) ? 0.0 : hourlyWage;
}
public double getWage()
{
return wage;
}
public void setHours(double hoursWorked)
{
hours = ( (hoursWorked >= 0.0) && (hoursWorked <= 168.0)) ? hoursWorked : 0.0;
}
public double getHours()
{
return hours;
}
public double earnings()
{
if(getHours() <= 40)
{
return getWage() * getHours();
}
else
{
return 40 * getWage() + ( getHours() - 40 ) * getWage() * 1.5;
}
}
public String toString()
{
return String.format("hourly employee: %s\n%s:$%,.2f; %s: $%,.2f" , super.toString() , "hourly wage" , getWage() , "hours worked" , getHours());
}
}
public class CommissionEmployee extends Employee
{
private double grossSales;
private double commissionRate;
public CommissionEmployee(String first , String last , String ssn , double sales , double rate)
{
super(first , last , ssn);
setGrossSales(sales);
setCommissionRate(rate);
}
public void setCommissionRate(double rate)
{
commissionRate = ( rate > 0.0 && rate < 1.0) ? rate : 0.0;
}
public double getCommissionRate()
{
return commissionRate;
}
public void setGrossSales(double sales)
{
grossSales = ( sales < 0.0 ) ? 0.0 : sales;
}
public double getGrossSales()
{
return grossSales;
}
public double earnings()
{
return getCommissionRate() * getGrossSales();
}
public String toString()
{
return String.format("%s: %s\n%s: $%,.2f; %s: %.2f" , "commission employee" , super.toString() , "gross sales" , getGrossSales() , "commission rate" , getCommissionRate());
}
}
public class BasePlusCommissionEmployee extends CommissionEmployee
{
private double baseSalary;
public BasePlusCommissionEmployee(String first , String last , String ssn , double sales , double rate , double salary)
{
super(first , last , ssn , sales , rate);
setBaseSalary(salary);
}
public void setBaseSalary(double salary)
{
baseSalary = ( salary < 0.0 ) ? 0.0 : salary;
}
public double getBaseSalary()
{
return baseSalary;
}
public double earnings()
{
return getBaseSalary() + super.earnings();
}
public String toString()
{
return String.format("%s %s; %s $%,.2f" , "base-salaried" , super.toString() , "base salary" , getBaseSalary());
}
}
public class PayrollSystemTest
{
public static void main(String args[])
{
SalariedEmployee salariedEmployee = new SalariedEmployee("John" , "Smith" , "111-11-1111" , 800.00 );
HourlyEmployee hourlyEmployee = new HourlyEmployee("Karen" , "Price" , "222-22-2222" , 16.75 , 40);
CommissionEmployee commissionEmployee = new CommissionEmployee("Sue" , "Jones" , "333-33-3333" , 10000 , .06);
BasePlusCommissionEmployee basePlusCommissionEmployee = new BasePlusCommissionEmployee("Bob" , "Lewis" , "444-44-4444" , 5000 , .04 , 300);
System.out.println("Employees processed individually:\n");
System.out.printf("%s\n%s: $%,.2f\n\n" , salariedEmployee , "earned" , salariedEmployee.earnings());
System.out.printf("%s\n%s: $%,.2f\n\n" , hourlyEmployee , "earned" , hourlyEmployee.earnings());
System.out.printf("%s\n%s: $%,.2f\n\n" , commissionEmployee , "earned" , commissionEmployee.earnings());
System.out.printf("%s\n%s: $%,.2f\n\n" , basePlusCommissionEmployee , "earned" , basePlusCommissionEmployee.earnings());
Employee employees[] = new Employee[4];
employees[0] = salariedEmployee;
employees[1] = hourlyEmployee;
employees[2] = commissionEmployee;
employees[3] = basePlusCommissionEmployee; // assign reference of an subclass object to superclass variable
System.out.println("Employees processed polymorphically:\n");
for(Employee currentEmployee : employees)
{
System.out.println(currentEmployee);
if(currentEmployee instanceof BasePlusCommissionEmployee)
{
BasePlusCommissionEmployee employee = (BasePlusCommissionEmployee) currentEmployee;
double oldBaseSalary = employee.getBaseSalary();
employee.setBaseSalary(1.10 * oldBaseSalary);
System.out.printf("new base salary with 10%% increase is : $%,.2f\n" , employee.getBaseSalary());
}
}
for(int j = 0 ; j < employees.length ; j++)
{
System.out.printf("Employee %d is a %s\n" , j , employees[j].getClass().getName());
}
}
}
this two examples are found in java programming book
the first code is that : we can use the straight forward method (invoking a method on a subclass object via superclass reference!) CommissionEmployee3 commissionEmployee2 = basePlusCommissionEmployee;
i have been trying this on the second code ! But it failed and i don't know why ! And so , i also trying the second code method by using downcast method on the first code..~it still failed .. struggling about this for few day ~
appreciate any replying ..~
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