почему мой вывод пуст при использовании наследования?

Question

Мне нужно создать программу, используя наследование, и я хочу распечатать введенные данные. Но когда я запускаю программу, она просто дает мне пустое пространство. Что не так с моим кодом? Я сделал ошибку при вызове переменной?

Это мой основной код

package labweek7;

import java.awt.Menu;
import java.util.Scanner;
import java.util.Vector;

public class Main {

    Vector<String> menu =new Vector<>();
    Scanner scan = new Scanner(System.in);

    //Employee emp; 
    Employee emp = new EmployeeFullTime(null, 0, null, null); 
    Employee emps = new EmployeePartTime(null, 0, null, null);
    EmployeeFullTime ft = new EmployeeFullTime(null, 0, null, null);
    EmployeePartTime pt = new EmployeePartTime(null, 0, null, null); 

    public Main() {
        int choice = 0;
        int pay;
        int time;
        int salary;


        do{
            System.out.println("ABC EMPLOYEE DATA");
            System.out.println("=================");
            System.out.println("1. Add Employee");
            System.out.println("2. View Employee");
            System.out.println("3. Resign");
            System.out.println("4. Exit");
            System.out.print("Choice: ");
            choice = scan.nextInt();
            scan.nextLine();

            switch(choice){
            case 1:
                String name = "";
                do{
                    System.out.print("Input employee name[must be more than 3 characters]: ");
                    name = scan.next();
                }while(! (name.length()>=3));
                emp.empName.add(name);

                int age;
                do{
                    System.out.print("Input employee age[>=17]: ");
                    age = scan.nextInt();
                }while(!(age>=17));
                emp.empAge.add(age);

                String role = "";
                do{
                    System.out.print("Input employee role[Assistant | Programmer](Case Sensitive): ");
                    role = scan.next();
                }while(!(role.equals("Assistant") || (role.equals("Programmer"))));
                emp.empRole.add(role);

                String type = "";
                do{
                    System.out.print("Input employee type[PartTime | FullTime](Case Sensitive): ");
                    type = scan.next();
                }while(!(type.equals("PartTime")|| type.equals("FullTime")));
                emp.empType.add(type);

                if(type.equals("PartTime")){
                    emp = new EmployeePartTime(name, age, role, type);
                    do{
                        System.out.print("Input pay per hour[>=10000]: ");
                        pay = scan.nextInt();
                    }while(!(pay>=10000));
                    pt.pays.add(pay);

                    do{
                        System.out.print("Input working hour per week[>0]: ");
                        time = scan.nextInt();
                    }while(!(time>0));
                    pt.hours.add(time);

                }
                else{
                    emps = new EmployeeFullTime(name, age, role, type);
                    do{
                        System.out.print("Input base salary[>=10000]: ");
                        salary = scan.nextInt();
                    }while(!(salary>=10000));
                    ft.salary.add(salary);
                }

                String status = "active";

                System.out.println("Success insert employee data");
                System.out.println("");
                System.out.println("Please any key to continue...");
                scan.nextLine();
                break;

            case 2:
                boolean ans = emp.empName.isEmpty();
                if(ans == true){
                    System.out.println("There is no employee data in the list");
                }
                else
                {
                    view(); 
                }


            }
        }while(choice!=4);

    }

    void view(){
        //for(int i=0; i<menu.size(); i++){
            System.out.println("Employee no."+ i);
            if(emp.empType.equals("FullTime")){
                System.out.println("Full Time Employee");
                System.out.println("===================");
                System.out.println("Status: " );
                for(int j=0; j<emp.empName.size(); j++){
                    System.out.println("Name: " + emps.empName.get(j));
                }
                System.out.println("Age: " + emps.empAge.get(i));
                System.out.println("Role: " + emps.empRole.get(i));
                System.out.println("Base salary per month: " + ft.salary.get(i));
                System.out.println("");
            }
            else
            {
                System.out.println("Part Time Employee");
            }
            System.out.println("===================");
            System.out.println("Status: " );
            System.out.println("Name: " + emp.empName.get(i));
            System.out.println("Age: " + emp.empAge.get(i));
            System.out.println("Role: " + emp.empRole.get(i));
            System.out.println("Pay per hour: "+pt.pays.get(i));
            System.out.println("Working hour per week: "+pt.hours.get(i));
            System.out.println("Salary per month: "+ pt.pays.get(i) * pt.hours.get(i));
        }
        System.out.println("\n\n");
        System.out.println("Press any key to continue...");
    //}
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        new Main();
    }

}

Это код родительского класса

package labweek7;

import java.util.Vector;

public abstract class Employee {

    public String name;
    public int age;
    public String role;
    public String type;

    Vector<String> empName = new Vector<>();
    Vector<Integer> empAge = new Vector<>();
    Vector<String> empRole = new Vector<>();
    Vector<String> empType = new Vector<>();

    public Employee(String name, int age, String role, String type) {
        // TODO Auto-generated constructor stub
        this.name = name;
        this.age = age;
        this.role = role;
        this.type = type;
    }

}

Это мой подкласс 1

    package labweek7;

    import java.util.Vector;

    public class EmployeePartTime extends Employee{

        int pay;
        int hour;
        Vector<Integer> pays = new Vector<>();
        Vector<Integer> hours = new Vector<>();

        public EmployeePartTime(String name, int age, String role, String type) {
            super(name, age, role, type);
        }

        public static void main(String[] args) {
            // TODO Auto-generated method stub

        }

    }

Это мой подкласс 2

package labweek7;

import java.util.Vector;

public class EmployeeFullTime extends Employee{

    int gaji; 
    Vector<Integer> salary = new Vector<>(); 

    public EmployeeFullTime(String name, int age, String role, String type) {
        super(name, age, role, type); 
    }

    public static void main(String[] args) {
        // TODO Auto-generated method stub

    }

}

Я сделал ошибку в for l oop? Почему мой код не печатает введенные элементы? Любая помощь приветствуется. Спасибо.