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 );
        PieceWorkerEmployee pieceWorkerEmployee =
            new PieceWorkerEmployee( "Rick", "Bridges", "555-55-5555", 2.25, 400);
                
        
        System.out.println( "Employee 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() );
        System.out.printf("%s\n%s: $%,.2f\n\n",
            pieceWorkerEmployee, "earned", pieceWorkerEmployee.earnings() );
        
        Employee employees[] = new Employee[ 5 ];
        
        employees[ 0 ] = salariedEmployee;
        employees[ 1 ] = hourlyEmployee;
        employees[ 2 ] = commissionEmployee;
        employees[ 3 ] = basePlusCommissionEmployee;
        employees[ 4 ] = pieceWorkerEmployee;
        
        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() );
            }
            System.out.printf(
                "earned $%,.2f\n\n", currentEmployee.earnings() );
            }
            
            for (int j = 0; j < employees.length; j++ )
                System.out.printf( "Employee %d is a %s\n", j,
                    employees[ j ].getClass().getName() );
    }
}

public class PieceWorkerEmployee extends Employee
{
    private double wage;
    private int pieces;
    
    public PieceWorkerEmployee( String first, String last, String ssn,
        double pieceWage, int piecesWorked )
    {
        super( first, last, ssn );
        setWage( pieceWage );
        setPieces( piecesWorked );
    }
    
    
    public void setWage( double pieceWage )
    {
        wage =  ( pieceWage >= 0.0 ) ? 0.0 :pieceWage;
    }
    
    public double getWage()
    {
        return wage;
    }
    
    public void setPieces( int piecesWorked )
    {
        pieces =  ( piecesWorked >= 0 ) ? 0 : piecesWorked;  
    }
    
    public int getPieces()
    {
        return pieces;
    }
    
    public double earnings()
        {
            return getPieces() * getWage();
        }
        
    public String toString()
    {
        return String.format( "%s: s\n%s: $%,.2f; %s: %.2f",
            "piece employee", super.toString(),
            "pieces worked", getPieces(),
            "piece wage", getWage() );
    }
}