[ch01] Separated getConnection method into subclass.

src/main/java/ch01/ch01_main.java

@@ -1,5 +1,6 @@
 package ch01;
 
+import ch01.springbook.user.dao.NUserDao;
 import ch01.springbook.user.dao.UserDao;
 import ch01.springbook.user.domain.User;
 
@@ -9,7 +10,7 @@ public class ch01_main {
 
 	public static void main(String[] args) throws ClassNotFoundException, SQLException {
 
-		UserDao dao = new UserDao();
+		UserDao dao = new NUserDao();
 
 		User user = new User();
 		user.setId("whiteship");

src/main/java/ch01/springbook/user/dao/DUserDao.java

@@ -0,0 +1,18 @@
+package ch01.springbook.user.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class DUserDao extends UserDao {
+
+	@Override
+	public Connection getConnection() throws ClassNotFoundException, SQLException {
+		Class.forName("com.mysql.jdbc.Driver");
+		Connection c = DriverManager.getConnection(
+			"jdbc:mysql://localhost/tobystudy?useUnicode=true&characterEncoding=UTF-8&useSSL=true&verifyServerCertificate=false",
+			"study",
+			"study");
+		return c;
+	}
+}

src/main/java/ch01/springbook/user/dao/NUserDao.java

@@ -0,0 +1,18 @@
+package ch01.springbook.user.dao;
+
+import java.sql.Connection;
+import java.sql.DriverManager;
+import java.sql.SQLException;
+
+public class NUserDao extends UserDao {
+
+	@Override
+	public Connection getConnection() throws ClassNotFoundException, SQLException {
+		Class.forName("com.mysql.jdbc.Driver");
+		Connection c = DriverManager.getConnection(
+			"jdbc:mysql://localhost/tobystudy?useUnicode=true&characterEncoding=UTF-8&useSSL=true&verifyServerCertificate=false",
+			"study",
+			"study");
+		return c;
+	}
+}

src/main/java/ch01/springbook/user/dao/UserDao.java

@@ -4,7 +4,7 @@
 
 import java.sql.*;
 
-public class UserDao {
+public abstract class UserDao {
 
 	public void add(User user) throws ClassNotFoundException, SQLException {
 		Connection c = getConnection();
@@ -43,12 +43,5 @@ public User get(String id) throws ClassNotFoundException, SQLException {
 		return user;
 	}
 
-	private Connection getConnection() throws ClassNotFoundException, SQLException {
-		Class.forName("com.mysql.jdbc.Driver");
-		Connection c = DriverManager.getConnection(
-			"jdbc:mysql://localhost/tobystudy?useUnicode=true&characterEncoding=UTF-8&useSSL=true&verifyServerCertificate=false",
-			"study",
-			"study");
-		return c;
-	}
+	public abstract Connection getConnection() throws ClassNotFoundException, SQLException;
 }