1장: IoC - 오브젝트 팩토리

관계를 맺어주는 관심사를 분리해보자.
덕분에 MainTest에서는 UserDao가 어떻게 생성되는 지 신경쓰지 않고 사용하면 그만이다.

src/main/java/com/toby/tobyspring/MainTest.java

@@ -2,15 +2,15 @@
 
 import com.toby.tobyspring.user.dao.ConnectionMaker;
 import com.toby.tobyspring.user.dao.DUserConnectionMaker;
+import com.toby.tobyspring.user.dao.DaoFactory;
 import com.toby.tobyspring.user.dao.UserDao;
 import com.toby.tobyspring.user.domain.User;
 
 import java.sql.SQLException;
 
 public class MainTest {
     public static void main(String[] args) throws SQLException, ClassNotFoundException {
-        ConnectionMaker connectionMaker = new DUserConnectionMaker();
-        UserDao userDao = new UserDao(connectionMaker);
+        UserDao userDao = new DaoFactory().userDao();
 
         User user = new User();
         user.setId("dahyekim");

src/main/java/com/toby/tobyspring/user/dao/DaoFactory.java

@@ -0,0 +1,9 @@
+package com.toby.tobyspring.user.dao;
+
+public class DaoFactory {
+    public UserDao userDao() {
+        ConnectionMaker connectionMaker = new DUserConnectionMaker();
+        UserDao userDao = new UserDao(connectionMaker);
+        return userDao;
+    }
+}

src/main/java/com/toby/tobyspring/user/dao/UserDao.java

@@ -10,6 +10,7 @@ public class UserDao {
     public UserDao(ConnectionMaker connectionMaker) {
         this.connectionMaker = connectionMaker;
     }
+
     public void add(User user) throws ClassNotFoundException, SQLException {
         Connection connection = connectionMaker.makeNewConnection();
         // sql 실행