Given: What two changes should you make to apply the DAO pattern to this class?

Question

Exhibit

Options

• AMake the Customer class abstract.
• BMake the customer class an interface.
• CMove the add, delete, find, and update methods into their own implementation class.
• DCreate an interface that defines the signatures of the add, delete, find, and update methods.
• EMake the add, delete, and find, and update methods private for encapsulation.
• FMake the getName and getID methods private for encapsulation.

• B
  7% (2)
• C
  74% (20)
• E
  15% (4)
• F
  4% (1)

Explanation

C:The methods related directly to the entity Customer is moved to a new class. D: Example (here Customer is the main entity): public class Customer { private final String id; private String contactName; private String phone; public void setId(String id) { this.id = id; } public String getId() { return this.id; } public void setContactName(String cn) { this.contactName = cn;} public String getContactName() { return this.contactName; } public void setPhone(String phone) { this.phone = phone; } public String getPhone() { return this.phone; } public interface CustomerDAO { public void addCustomer(Customer c) throws DataAccessException; public Customer getCustomer(String id)throws DataAccessException; public List getCustomers() throws DataAccessException; public void removeCustomer(String id) throws DataAccessException; public void modifyCustomer(Customer c) throws DataAccessException; } Note: DAO Design Pattern *Abstracts and encapsulates all access to a data source *Manages the connection to the data source to obtainand store data *Makes the code independent of the data sources and data vendors (e.g. plain-text, xml, LDAP, MySQL, Oracle, DB2)

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