A company pays its employees on a weekly basis. The employees are of five types:

1. Salaried employees are paid a fixed weekly salary regardless of the number of hours worked,
2. Hourly employees are paid by the hour and receive overtime pay (i.e., 1.5 times their hourly salary rate) for all hours worked in excess of 40 hours,
3. Piece workers are paid by the number of merchandise produced in a week,
4. Commission employees are paid a percentage (10% for example) of their sales.
5. Salaried-commission employees are paid a base salary plus a percentage (5% for example) of total sales to their base salaries.

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import java.util.ArrayList; public class PayrollSystemTester { public static void main( String args[] ) { // create an ArrayList to hold different types of employee objects. ArrayList employees = new ArrayList<>(); // initialize the arraylist emploees with Employees employees.add(new SalariedEmployee( "James", "Lebron", "121-11-1111", 1200.00)); employees.add(new HourlyEmployee("Maria", "Garcia", "232-22-2222", 26.75, 50)); employees.add( new CommissionEmployee("David", "Kim", "343-33-3333", 20000, .07)); employees.add( new BasePlusCommissionEmployee( "John", "Miller", "454-44-4444", 9000, .05, 900)); employees.add( new PieceWorker("Robert", "Green", "565-55-5555", 7.25, 700)); employees.add(new SalariedEmployee( "Jeff", "Turner", "111-11-1111", 800.00 )); employees.add(new HourlyEmployee("Samuel", "Bryant", "222-22-2222", 16.75, 40)); employees.add( new CommissionEmployee("Avery", "Butler", "333-33-3333", 10000, .06)); employees.add( new BasePlusCommissionEmployee( "Lucas", "Wood", "444-44-4444", 5000, .04, 300)); employees.add( new PieceWorker("Robert", "Williams", "555-55-5555", 2.25, 400));

System.out.println( "Employees processed polymorphically: " ); // generically process each element in array employees double salariedEmployeeTotal = 0; double hourlyEmployeeTotal = 0; double commissionEmployeeTotal = 0; double commissionPlusEmployeeTotal = 0; double pieceWorkerEmployeeTotal = 0; for ( Employee currentEmployee : employees ) { System.out.println( currentEmployee ); // invokes toString System.out.printf( "earned $%,.2f ", currentEmployee.earnings() ); if (currentEmployee instanceof SalariedEmployee) salariedEmployeeTotal += currentEmployee.earnings(); else if (currentEmployee instanceof HourlyEmployee) hourlyEmployeeTotal += currentEmployee.earnings(); else if (currentEmployee instanceof BasePlusCommissionEmployee) commissionPlusEmployeeTotal += currentEmployee.earnings(); else if (currentEmployee instanceof CommissionEmployee) commissionEmployeeTotal += currentEmployee.earnings(); else pieceWorkerEmployeeTotal += currentEmployee.earnings(); } // end for System.out.printf (" %-40s%10.2f","Salaried Employee Total:", salariedEmployeeTotal); System.out.printf (" %-40s%10.2f","Hourly Employee Total:", hourlyEmployeeTotal); System.out.printf (" %-40s%10.2f","Commission Employee Total:", commissionEmployeeTotal); System.out.printf (" %-40s%10.2f","Base Plus Commission Employee Total:", commissionPlusEmployeeTotal); System.out.printf (" %-40s%10.2f","PieceWorker Employee Total:", pieceWorkerEmployeeTotal); } // end main } // end class PayrollSystemTest

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See the sample output

Employees processed polymorphically:

salaried employee: Lebron James

social security number: 121-11-1111

weekly salary: $1,200.00

earned $1,200.00

hourly employee: Maria Garcia

social security number: 232-22-2222

hourly wage: $26.75; hours worked: 50.00

earned $1,471.25

commission employee: David Kim

social security number: 343-33-3333

gross sales: $20,000.00; commission rate: 0.07

earned $1,400.00

base-salaried commission employee: John Miller

social security number: 454-44-4444

gross sales: $9,000.00; commission rate: 0.05; base salary: $900.00

earned $1,350.00

piece worker: Robert Green

social security number: 565-55-5555

wage per piece: $7.25; pieces produced: 700

earned $5,075.00

salaried employee: Jeff Turner

social security number: 111-11-1111

weekly salary: $800.00

earned $800.00

hourly employee: Samuel Bryant

social security number: 222-22-2222

hourly wage: $16.75; hours worked: 40.00

earned $670.00

commission employee: Avery Butler

social security number: 333-33-3333

gross sales: $10,000.00; commission rate: 0.06

earned $600.00

base-salaried commission employee: Lucas Wood

social security number: 444-44-4444

gross sales: $5,000.00; commission rate: 0.04; base salary: $300.00

earned $500.00

piece worker: Robert Williams

social security number: 555-55-5555

wage per piece: $2.25; pieces produced: 400

earned $900.00

Salaried Employee Total: 2000.00

Hourly Employee Total: 2141.25

Commission Employee Total: 2000.00

Base Plus Commission Employee Total: 1850.00

PieceWorker Employee Total: 5975.00