SRP Solution Part 1

S_SingleResponsabilitySolution.java

public class S_SingleResponsabilitySolution {

    private static class ConnectionDAO {
        private Properties connectionProps;
        private Connection conn;

        private static final String URL = "jdbc:mysql://localhost:3306/employee?useSSL=false";

        private ConnectionDAO(String username, String password) {
            connectionProps = new Properties();
            connectionProps.put("user", username);
            connectionProps.put("password", password);
        }

        private Connection createConnection() {
            //Cria conexão com o banco
        }
    }
}