Read Custom Object data in java

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

public class ReadCustomObject {

    public static class Employee {
        public Employee(int employeeId, String employeeName) {
            this.employeeId = employeeId;
            this.employeeName = employeeName;
        }

        private int employeeId;
        private String employeeName;
        public int getEmployeeId() {
            return employeeId;
        }

        public void setEmployeeId(int employeeId) {
            this.employeeId = employeeId;
        }

        public String getEmployeeName() {
            return employeeName;
        }

        public void setEmployeeName(String employeeName) {
            this.employeeName = employeeName;
        }
    }

    public static class Person {
        private int personId;

        public Person(int personId, Employee employee) {
            this.personId = personId;
            this.employee = employee;
        }

        private Employee employee;

        public int getPersonId() {
            return personId;
        }

        public void setPersonId(int personId) {
            this.personId = personId;
        }

        public Employee getEmployee() {
            return employee;
        }

        public void setEmployee(Employee employee) {
            this.employee = employee;
        }
    }


    public static void main( String[] args )
    {
        Employee emp1 = new Employee(101,"one");
        Employee emp2 = new Employee(102,"two");
        Employee emp3 = new Employee(103,"three");
        Employee emp4 = new Employee(104,"four");

        Person p1 = new Person(201, emp1);
        Person p2 = new Person(202, emp2);
        Person p3 = new Person(203, emp3);
        Person p4 = new Person(204, emp4);

        List<Employee> employeeList = new ArrayList<Employee>();
        employeeList.add(emp1);
        employeeList.add(emp2);
        employeeList.add(emp3);
        employeeList.add(emp4);

        List<Person> personList = new ArrayList<Person>();
        personList.add(p1);
        personList.add(p2);
        personList.add(p3);
        personList.add(p4);


            List<Integer> numbers =new ArrayList<>();
        List<Employee> e =new ArrayList<>();

        List<Employee>  list = employeeList.stream().filter(employee -> Boolean.parseBoolean(employee.getEmployeeName())).collect(Collectors.toList());

        employeeList.stream()
                .map(employee -> numbers.add(employee.getEmployeeId()))
                .collect(Collectors.toList());
        System.out.println(employeeList.stream().collect(Collectors.toList()));
        personList.stream()
                .map(employee -> e.add(employee.getEmployee()))
                .collect(Collectors.toList());
        List<Integer> numbers1= e.stream().map(employee -> employee.getEmployeeId()).collect(Collectors.toList());



        System.out.println(numbers);
        System.out.println(numbers1);
    }
}