The language is Java.

Please explain every step so I can learn and follow along, thank you. I will upvote :)

Create an abstract class Employee with the following instance variables (protected): Employee name (string) Employee number (string) Hire date (string - you do not have to use the Date class) Then create a concrete subclass: ProductionWorker that inherits from Employee, and in addition contains the following instance variables (protected): Hourly pay rate (double) Shift (in: 1 = Day, 2 = Night) Next create a concrete subclass: ShiftSupervisor that inherits from Employee, and in addition contains the following instance variables (private): Annual salary (double) Annual bonus (double) Lastly create a concrete subclass: Team Leader, which inherits from ProductionWorker, and in addition contains the following instance variables (private): Monthly bonus (double) Required training hours (int) Number of training hours attended (int) For each class above write one or more constructors do not forget to call the superclass's constructor!); the get and set routines for each instance variable are optional Create 4 production workers, one team leader, and one shift supervisor (in the main routine; do NOT prompt the user for the data). Do NOT instantiate any objects of the Employee class directly. Each class must be defined in a separate.java file; every class except the driver must have a toString0 method. The main routine should be in a separate driver class, and must use each object's toString() method to display the values of the object's fields