java program that compute the average salary of 20 workers : I've been stuck on this a while, a java program to compute average salary of 20 workers and this what i came up with. please help .............................................................................................................................................................

    import java.util.Scanner;
     
    class Employee
    {
        int age;
        String name, address, gender;
        Scanner get = new Scanner(System.in);
        Employee()
        {
            System.out.println("Enter Name of the Employee:");
            name = get.nextLine();
            System.out.println("Enter Gender of the Employee:");
            gender = get.nextLine();
            System.out.println("Enter Address of the Employee:");
            address = get.nextLine();
            System.out.println("Enter Age:");
            age = get.nextInt();
        }
     
        void display()
        {
            System.out.println("Employee Name: "+name);
            System.out.println("Age: "+age);
            System.out.println("Gender: "+gender);
            System.out.println("Address: "+address);
        }
    }
     
    class fullTimeEmployees extends Employee
    {
        float salary;
        int des;
        fullTimeEmployee()
        {
            System.out.println("Enter Designation:");
            des = get.nextInt();
            System.out.println("Enter Salary:");
            salary = get.nextFloat();
        }
        void display()
        {
            System.out.println("=============================="+"\n"+"Full Time Employee Details"+"\n"+"=============================="+"\n");
            super.display();
            System.out.println("Salary: "+salary);
            System.out.println("Designation: "+des);
        }
    }
     
    class partTimeEmployees extends Employee
    {
        int workinghrs, rate;
        partTimeEmployees()
        {
            System.out.println("Enter Number of Working Hours:");
            workinghrs = get.nextInt();
        }
        void calculatepay()
        {
            rate = 8 * workinghrs;
        }
     
        void display()
        {
            System.out.println("=============================="+"\n"+"Part Time Employee Details"+"\n"+"=============================="+"\n");
            super.display();
            System.out.println("Number of Working Hours: "+workinghrs);
            System.out.println("Salary for "+workinghrs+" working hours is: $"+rate);
        }
    }
     
    class Employees
    {
        public static void main(String args[])
        {
            System.out.println("================================"+"\n"+"Enter Full Time Employee Details"+"\n"+"================================"+"\n");
            fullTimeEmployees ob1 = new fullTimeEmployees();
            partTimeEmployees ob = new partTimeEmployees();
            System.out.println("================================"+"\n"+"Enter Part Time Employee Details"+"\n"+"================================"+"\n");
            ob1.display();
            ob.calculatepay();
            ob.display();
        }
    }

Please help guys