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1. Using interfaces for writing DAO classes    stackoverflow.com

I'm creating a new web application which will use a bunch of Data Access Object(DAO) classes for doing CRUD operations on the data. I know I should write java interfaces when ...

2. Why use default access for methods in a generic DAO interface?    stackoverflow.com

I found this code for a generic DAO interface while browsing around: 

public interface GenericDAO<T, ID extends Serializable> {

    Class<T> getEntityClass();

    T findById(final ID id);

  ...

3. Using interfaces in combination with a generic asbtract DAO?    stackoverflow.com

I have a BaseRepository generic abstract class with some interesting methods which can be used with JPA. More lately I've gotten into the habit of writing DAOs and Services against predefined ...

4. Creating Service layer and DAO layer (interface+implentation) or implentation only    stackoverflow.com

i am confused about the structure of creating service layer and DAO layer: in some examples i see some people creating interface+implementation for both service and DAO and in other examples i ...