toString () should return a string with the values of instance variables of employee object as follows. For example, the method should return the following string for a employee Karan Sharma with SSN as 1234567XX. irst name: Karan, Last name : Sharma, SSN: 1234567XX . equals() should accept a employee object reference as argument and return true if all instance variables of calling object are same values as those of passed employee object, respectively, or false otherwise. earnings() should do nothing (i.e., empty body). This method is for polymorphism to call appropriate earnings () method of subclass