@Entity(name = "Contact")
public static class Contact {
    @Id
    private Integer id;
    private Name name;
    private String notes;
    private URL website;
    private boolean starred;
    //Getters and setters are omitted for brevity
}
@Embeddable
public class Name {
    private String firstName;
    private String middleName;
    private String lastName;
    // getters and setters omitted
}

Entities, by nature of their unique identifier, exist independently of other objects whereas values do not. Entities are domain model classes which correlate to rows in a database table, using a unique identifier. Because of the requirement for a unique identifier, entities exist independently and define their own lifecycle. The Contact class itself would be an example of an entity.