DAOImpl接口(DAOImpl interfaces)

DAOImpl接口(DAOImpl interfaces)

在Spring中，在创建DAO类来访问数据库时，我还实现了DAO接口。 即：

public interface EmployeeDAO { public void addEmployee(Employee emp); } @Repository public class EmployeeDAOImpl implements EmployeeDAO { public void addEmployee(Employee emp) { /* code here */ } }

为什么要实现接口？ 为什么“公共级员工DAOImpl”还不够？ 谢谢。

In Spring, while creating a DAO class to access to database, i also implement a DAO interface. i.e. :

public interface EmployeeDAO { public void addEmployee(Employee emp); } @Repository public class EmployeeDAOImpl implements EmployeeDAO { public void addEmployee(Employee emp) { /* code here */ } }

Why do we implement an interface? Why "public class EmployeeDAOImpl" is not enough? Thank you.

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