[appengine-java] how to build same entity group

[dreamy]

I have two entity.
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class Person{
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    @Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
    private String person_id;
}

public class Telephone{
    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    @Extension(vendorName="datanucleus", key="gae.encoded-pk",
value="true")
    private String telephone_id;

    @Persistent
    private String person_id;  //this field point to  Person
}
Person Module manager Person  create/update/delete/query
Telephone module manaer   telephone   create/update/delete/query

Person can have 0 or mulity telephone but telephone only point to one
person or Telephone.person_id=null

Now there is a third module manager relation of  Person  and
Telephone .

if person have telephone( telephone1,telephone2,telephone3) and user
update person's telephone is telephone2,telephone3,telephone4,    how
to implements this?

is there and code example? thants a lot

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