Polymorphic Payroll Solution using Java

Create an application that collects user data and calculates the paycheck based upon the type of employee they are. Salary, Hourly, Commissioned

I need some guidance. This is what I have so far...

public abstract class Employee { private String fName; private String lName; private String taxID; // Constructor public Employee( String first, String last, String ssn) { fName = first; lName = last; taxID = ssn; } public void setFName(String first) { fName = first; } public String getFName() { return fName; } public void setLName(String last) { fName = last; } public String getLName() { return lName; } public void setTaxID(String ssn) { taxID = ssn; } public String getTaxID() { return taxID; } @Override public String toString(){ return ("Employee: " + getLName() + "," + getFName() + "; " + getTaxID()); } // abstract empty method public abstract double getEarnings(); }