1.オブジェクトと依存関係-IoC

1.4制御反転（IoC）

1.4.1対象工場

ファクトリ

public class DaoFactory {
    public UserDao userDao() {
        ConnectionMaker connectionMaker = new DConnectionMaker();
        UserDao userDao = new UserDao(connectionMaker);

        return userDao;
    }
}

public class main {
    public static void main(String[] args) throws SQLException, ClassNotFoundException {

        UserDao userDao = new DaoFactory().userDao();
        
        ...
	}
}

設計図としての工場

1.4.2利用対象工場

public class DaoFactory {
    public UserDao userDao() {
        ConnectionMaker connectionMaker = new DConnectionMaker();
        UserDao userDao = new UserDao(connectionMaker);

        return userDao;
    }

    public AccountDao accountDao() {
        ConnectionMaker connectionMaker = new DConnectionMaker();
        AccountDao accountDao = new AccountDao(connectionMaker);

        return accountDao;
    }

    public MessageDao messageDao() {
        ConnectionMaker connectionMaker = new DConnectionMaker();
        MessageDao messageDao = new MessageDao(connectionMaker);

        return messageDao;
    }
}

public class DaoFactory {
    public UserDao userDao() {
        UserDao userDao = new UserDao(connectionMaker());

        return userDao;
    }

    public AccountDao accountDao() {
        AccountDao accountDao = new AccountDao(connectionMaker());

        return accountDao;
    }

    public MessageDao messageDao() {
        MessageDao messageDao = new MessageDao(connectionMaker());

        return messageDao;
    }
    
    public ConnectionMaker connectionMaker() {
        // 분리해서 중복을 제거한 ConnectionMaker 타입 오브젝트 생성 코드
    	return new DConnectionMaker();
    }
}

1.4.3制御権の移転による逆転制御関係