public class Student {

    private String name;
    private String ra;
    private Contact contact;
    private Address address;

    private Student(String name, String ra, Contact contact, Address address) {
        this.name = name;
        this.ra = ra;
        this.contact = contact;
        this.address = address;
    }

    public String getName() {
        return name;
    }

    public String getRa() {
        return ra;
    }

    public Contact getContact() {
        return contact;
    }

    public Address getAddress() {
        return address;
    }

    public static class StudentBuilder {

        private String name;
        private String ra;
        private Contact contact;
        private Address address;

        public StudentBuilder setName(String name) {
            this.name = name;
            return this;
        }

        public StudentBuilder setRa(String ra) {
            this.ra = ra;
            return this;
        }

        public StudentBuilder setContact(String email, String phone, String cellPhone) {
            this.contact = new Contact(new Email(email), new Phone(phone), new Phone(cellPhone));
            return this;
        }

        public StudentBuilder setAddress(String address, String cep) {
            this.address = new Address(address, cep);
            return this;
        }

        public void validState() {
            //validação de atributos obrigatórios
        }

        public Student build() {
            validState();
            return new Student(name, ra, contact, address);
        }
    }
}