POJO를 사용하여 데이터 모델링하기

import org.bson.types.ObjectId;
public final class Person {
    private ObjectId id;
    private String name;
    private int age;
    private Address address;
    public Person() {}
    public Person(final String name, final int age, final Address address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }
    public ObjectId getId() { return id; }
    public void setId(final ObjectId id) { this.id = id; }
    public String getName() { return name; }
    public void setName(final String name) { this.name = name; }
    public int getAge() { return age; }
    public void setAge(final int age) { this.age = age; }
    public Address getAddress() { return address; }
    public void setAddress(final Address address) { this.address = address; }
    @Override
    public String toString() {
        return "Person{"
                + "id='" + id + "'"
                + ", name='" + name + "'"
                + ", age=" + age
                + ", address=" + address
                + "}";
    }
}

public final class Address {
    private String street;
    private String city;
    private String zip;
    public Address() {}
    public Address(final String street, final String city, final String zip) {
        this.street = street;
        this.city = city;
        this.zip = zip;
    }
    public String getStreet() { return street; }
    public void setStreet(final String street) { this.street = street; }
    public String getCity() { return city; }
    public void setCity(final String city) { this.city = city; }
    public String getZip() { return zip; }
    public void setZip(final String zip) { this.zip = zip; }
    @Override
    public String toString() {
        return "Address{"
                + "street='" + street + "'"
                + ", city='" + city + "'"
                + ", zip='" + zip + "'"
                + "}";
    }
}