JPA，多对多关系，删除所有以前的关系并输入新关系

@Entity
@Table(name = "Person")
public class Person {
    @Id
    @GeneratedValue
    private Long id;

    private String name;

    @OneToMany(mappedBy = "person")
    private Set<Address> addresses;

    // 构造方法、getter和setter方法等
}

@Entity
@Table(name = "Address")
public class Address {
    @Id
    @GeneratedValue
    private Long id;

    private String street;

    private String city;

    @ManyToOne
    private Person person;

    // 构造方法、getter和setter方法等
}

EntityManager em = EntityManagerFactory.createEntityManager();
em.getTransaction().begin();

// 删除以前的所有关系
em.remove(em.getReference(Person.class, person.getId()));
em.remove(em.getReference(Address.class, address.getId()));

// 输入新的关系
Person newPerson = new Person("John Doe");
Address newAddress = new Address("123 Main St", "Anytown", person);
em.persist(newPerson);
em.persist(newAddress);

em.getTransaction().commit();
em.close();