Primeira vez com Firebird

package com.fabiano;

import java.sql.*;

import javax.swing.JOptionPane;
import javax.swing.JFrame;
import javax.swing.JPanel;
import java.awt.BorderLayout;
import java.awt.Dimension;

public class Banco {

	private Connection con;

	private String SQL = "SELECT * FROM AGENDA"; // Comando SQL

	private JFrame jFrame = null; 

	private JPanel jContentPane = null;

	public Banco() {
		this.getJFrame();

		try {
			Class.forName("org.firebirdsql.jdbc.FBDriver");
			con = DriverManager.getConnection(
					"jdbc:firebirdsql:localhost/3050:C:/TUTORIAL.GDB",
					"SYSDBA", "masterkey");

		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	public void selecionar() {
		try {

			Statement stmt = con.createStatement();
			ResultSet res = stmt.executeQuery(SQL);
			while (res.next()) {
				System.out.println(res.getInt(1));
				System.out.println(res.getString(2));
				System.out.println(res.getString(3));
				System.out.println("=================");
			}
			res.close();
			stmt.close();
		} catch (SQLException sqle) {
			JOptionPane.showMessageDialog(null, "A conexão falhou "
					+ sqle.toString(), "Aviso", 2);
		}
	}

	public void inserir() {
		try {
			Statement stmt = con.createStatement();
			stmt
					.executeUpdate(" INSERT INTO AGENDA VALUES (10,'GISELE','DELPHI') ");
			stmt.close();

		} catch (SQLException sqle) {
			sqle.printStackTrace();
		}
	}

	/**
	 * This method initializes jFrame
	 * 
	 * @return javax.swing.JFrame
	 */
	private JFrame getJFrame() {
		if (jFrame == null) {
			jFrame = new JFrame();
			jFrame.setSize(new Dimension(272, 132));
			jFrame.setContentPane(getJContentPane());
		}
		return jFrame;
	}

	/**
	 * This method initializes jContentPane
	 * 
	 * @return javax.swing.JPanel
	 */
	private JPanel getJContentPane() {
		if (jContentPane == null) {
			jContentPane = new JPanel();
			jContentPane.setLayout(new BorderLayout());
		}
		return jContentPane;
	}

	public static void main(String[] args) {
		Banco banco = new Banco();

		// banco.inserir();
		banco.selecionar();
	}

}