Example 8.10  Entity Inherits Value Object Strategy - Value Object 
Class

// This is the value object class inherited by
// the entity bean
public class ContactVO 
  implements java.io.Serializable { 

  // public members
  public String firstName;
  public String lastName; 
  public String address;

  // default constructor
  public ContactVO() {}

  // constructor accepting all values
  public ContactVO(String firstName, 
    String lastName, String address){
      init(firstName, lastName, address);
  }

  // constructor to create a new VO based 
  // using an existing VO instance
  public ContactVO(ContactVO contact) {
    init (contact.firstName, 
      contact.lastName, contact.address);
  }

  // method to set all the values
  public void init(String firstName, String 
              lastName, String address) { 
    this.firstName = firstName; 
    this.lastName = lastName; 
    this.address = address;
  } 

  // create a new value object 
  public ContactVO getData() { 
    return new ContactVO(this);
  } 
}