Modify the payroll system of Figs. 10.4–10.9 to include an additional Employee s

Modify the payroll system of Figs. 10.4–10.9 to include an additional Employee subclass PieceWorker that represents an employee whose pay is based on the number of pieces of merchandise produced. Class PieceWorker should contain private instance variables wage (to store the employee’s wage per piece) and pieces (to store the number of pieces produced). Provide a concrete implementation of method earnings in class PieceWorker that calculates the employee’s earnings by multiplying the number of pieces produced by the wage per piece. Instantiate a PieceWorker object in PayrollSystemTest.java and add a print statement after the print statement for basePlusCommissionEmployee for your new PieceWorker object thereby demonstrating that the new class works. Modify the array of Employee variables in PayrollSystemTest.java to store references to objects of each concrete class in the new Employee hierarchy (SalariedEmployee, CommissionEmployee, HourlyEmployee, BasePlusCommissionEmployee, and now PieceWorker). For each Employee, display its String representation and earnings. PieceWorker