Sample of Custom Single LinkedList

EmployeeLinkedList.java

public class EmployeeLinkedList {

    private EmployeeNode head;
    private int size;

    public void addToFront(Employee employee) {
        EmployeeNode node = new EmployeeNode(employee);
        node.setNext(head);
        head = node;
        size++;
    }

    public EmployeeNode removeFromFront() {
        if (isEmpty()) {
            return null;
        }

        EmployeeNode removedNode = head;
        head = head.getNext();
        size--;
        removedNode.setNext(null);
        return removedNode;
    }

    public int getSize() {
        return size;
    }

    public boolean isEmpty() {
        return head == null;
    }

    public void printList() {
        EmployeeNode current = head;
        System.out.print("HEAD -> ");
        while (current != null) {
            System.out.println(current);
            System.out.print(" -> ");
            current = current.getNext();
        }
        System.out.println((Object) null);
    }

}

EmployeeLinkeeList.java

public class Employee {

    private String firstName;
    private String lastName;
    private int id;

    public Employee(String firstName, String lastName, int id) {
        this.firstName = firstName;
        this.lastName = lastName;
        this.id = id;
    }

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        Employee employee = (Employee) o;

        if (id != employee.id) return false;
        if (!firstName.equals(employee.firstName)) return false;
        return lastName.equals(employee.lastName);
    }

    @Override
    public int hashCode() {
        int result = firstName.hashCode();
        result = 31 * result + lastName.hashCode();
        result = 31 * result + id;
        return result;
    }

    @Override
    public String toString() {
        return "Employee{" +
                "firstName='" + firstName + '\'' +
                ", lastName='" + lastName + '\'' +
                ", id=" + id +
                '}';
    }

}

EmployeeNode.java

public class EmployeeNode {

    private Employee employee;
    private EmployeeNode next;

    public EmployeeNode(Employee employee) {
        this.employee = employee;
    }

    public Employee getEmployee() {
        return employee;
    }

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

    public EmployeeNode getNext() {
        return next;
    }

    public void setNext(EmployeeNode next) {
        this.next = next;
    }

    public String toString() {
        return employee.toString();
    }
}