Enthuware

As "getStudentDAO()" is static, isn't this also Singleton pattern? Just to clarify, thanks.

No, this is not a singleton pattern. You may read about Singleton pattern here: https://blogs.oracle.com/JavaFundamenta ... loops_with

Isn't it mandatory that factory pattern must take some type param in order to constuct an object?
for. e.g.
public class DAOManager{          
public static StudentDAO getStudentDAO(String type){         return new StudentDAOJpaImpl();     }      }

No, it is not mandatory for a factory pattern to take some parameter.