Mutator methods

Hey guys I wrote this Java program but the problem is that I need to fix the mutator methods (with something like public void set...). Please can someone add them in for me I would be forever grateful.

Code:

import java.util.*;

public class MainDemo {
    public static void main(String[] args){
             //Initialization Code....
    }
}
class Employee{
    int empID;
    String eFirstname;
    String eLastname;
    String email;
    String position;
    String username;
    String password;
    Employee( ){
        System.out.println("Employee Class Constructor"); 
    }
    @Override
    public String toString(){
        String s1= "empID: "+empID+"\neFirstname: "+eFirstname+"\neLastname: "+eLastname+"\nemail: "+email;
        String s2="\nposition: "+position+"\nusername: "+username+"\npassword: "+password; 
        return s1+s2;
    }
    void empSet(){
        //Mutator method
        System.out.println("Enter Employee Details:");
        Scanner sc = new Scanner(System.in);
        System.out.println("empID, Firstname, Lastname, email, position, username, password");
        this.empID = sc.nextInt();
        this.eFirstname = sc.next();
        this.eLastname = sc.next();
        this.email = sc.next();
        this.position = sc.next();
        this.username = sc.next();
        this.password = sc.next();
    }
    void empGet(){
        //Accessor Method
        System.out.println(this.toString());
    }
}
class GeneralManager extends Employee{
    String cellPhone;
    double monthlySalary;
    GeneralManager(){
        System.out.println("General Manager Class Constructor");
    }
    void SetGM(){
        this.empSet();
        //Mutator Method
        System.out.println("Enter GeneralManager extra details:");
        Scanner sc = new Scanner(System.in);
        System.out.println("cellPhone, monthlysalary");
        this.cellPhone = sc.next();
        this.monthlySalary = sc.nextDouble();
    }
    void getGM(){
        //Accessor Method     
        System.out.println(this.toString());
    }
    @Override
    public String toString(){
        return super.toString()+"\ncellPhone: "+this.cellPhone+"\nmonthlySalary: "+this.monthlySalary;
    }
}
class SecurityOfficer extends Employee{
   boolean fiearmLicence;
   double hourlyRate;
    SecurityOfficer(){
        System.out.println("SecurityOfficer Class Constructio");
    }
    void setSO(){
        this.empSet();
        //Mutator Method
        System.out.println("Enter SecurityOfficer extra details:");
        Scanner sc = new Scanner(System.in);
        System.out.println("fiearmLicence, hourlyRate");
        this.fiearmLicence = sc.nextBoolean();
        this.hourlyRate = sc.nextDouble();
    }
    void getAC(){
        System.out.println(this.toString());
    }
    @Override
    public String toString(){
        return super.toString()+"\nfiearmLicence: "+this.fiearmLicence+"\nhourlyRate: "+this.hourlyRate;
    } 
}
class AdminClerk extends Employee{
    double weeklywage;
    AdminClerk(){
        System.out.println("AdminClerk Class Constructio");
    }
    void setAC(){
        this.empSet();
        //Mutator Method
        System.out.println("Enter GeneralManager extra details:");
        Scanner sc = new Scanner(System.in);
        System.out.println("weeklywage");
        this.weeklywage = sc.nextDouble();
  
    }
    void getAC(){
        System.out.println(this.toString());
    }
    @Override
    public String toString(){
        return super.toString()+"\nWeeklywage:"+this.weeklywage;
    } 
}