Quiz em Java

package quizzes;

import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import javax.swing.ButtonGroup;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JRadioButton;
import javax.swing.JTextField;

public class Main extends JFrame implements ActionListener {
	String[][] perguntas = new String[3][6];
	JRadioButton[] jrPerguntas = new JRadioButton[4];
	JLabel jlPergunta = new JLabel("");
	JLabel jlPontuacao = new JLabel("Pontuacao: 0");
	int posAtual = 0;
	int pontos = 0;
	JButton jbResponder = new JButton("Responder");
	ButtonGroup bgOp = new ButtonGroup();

	public Main() {
		super("Quizz");
		setLayout(new GridLayout(7, 1));
		carregaPerguntas();

		for (int id = 0; id < 4; id++) {
			jrPerguntas[id] = new JRadioButton();
			bgOp.add(jrPerguntas[id]);
		}

		montaTela();
		jlPontuacao.setHorizontalAlignment(JTextField.RIGHT);
		add(jlPergunta);
		add(jrPerguntas[0]);
		add(jrPerguntas[1]);
		add(jrPerguntas[2]);
		add(jrPerguntas[3]);
		add(jlPontuacao);
		add(jbResponder);
		jbResponder.addActionListener(this);
		pack();
		setLocationRelativeTo(null);
		setVisible(true);
	}

	public void carregaPerguntas() {

		Connection conn = null;
		PreparedStatement stmt = null;
		ResultSet rs = null;

		try {
			String driver = "com.mysql.jdbc.Driver";
			String url = "jdbc:mysql://localhost/quizzes";
			String user = "root";
			String pass = "";

			String sql1 = "SELECT COUNT(*) as qtd FROM Perguntas";
			String sql2 = "SELECT * FROM perguntas as p, respostas as r WHERE p.COD_Pergunta = r.COD_Pergunta";

			Class.forName(driver);
			conn = DriverManager.getConnection(url, user, pass);
			stmt = conn.prepareStatement(sql1);
			rs = stmt.executeQuery();

			rs.next();
			int qtdP = rs.getInt("qtd");

			stmt = conn.prepareStatement(sql2);
			rs = stmt.executeQuery();

			String pergunta = rs.getString("perguntas");
			System.out.println(pergunta);

			String resposta = rs.getString("respostas");
			System.out.println(resposta);

			int codPergunta = rs.getInt("COD_Pergunta");
			int codResposta = rs.getInt("COD_Resposta");

			rs.next();
			for (int i = 1; i < qtdP; i++) {
				perguntas[i][0] = rs.getString("perguntas");

				for (int j = 1; j < 4; j++) {
					if (rs.getString("CertoErrado") == "e") {
						perguntas[i][j] = rs.getString("respostas");
					} else {
						perguntas[i][4] = String.valueOf(j);
					}
					rs.next();

				}
			}
		}

		catch (ClassNotFoundException ex) {
			System.out.println("Driver não encontrado!");
		}

		catch (SQLException ex) {
			System.out.println("Erro de banco: " + ex.getMessage());
		}

		finally {

			if (rs != null) {
				try {
					rs.close();
				} catch (SQLException ex) {
				}
			}

			if (stmt != null) {
				try {
					stmt.close();
				} catch (SQLException ex) {
				}
			}

			if (conn != null) {
				try {
					conn.close();
				} catch (SQLException ex) {
				}
			}
		}
	}

	public void montaTela() {
		jlPergunta.setText(perguntas[posAtual][0]);
		for (int id = 0; id < 4; id++) {
			jrPerguntas[id].setText(perguntas[posAtual][id + 1]);
		}
	}

	public static void main(String[] args) {
		new Main();
	}

	@Override
	public void actionPerformed(ActionEvent e) {
		// TODO Auto-generated method stub
		int respostaCerta = Integer.parseInt(perguntas[posAtual][5]);

		if (jrPerguntas[respostaCerta - 1].isSelected()) {
			pontos++;
		} else {
			pontos--;
		}
		jlPontuacao.setText("Pontuacao: " + pontos);
		if (posAtual < 2)
			posAtual++;
		else
			JOptionPane.showMessageDialog(this, "Game Over");
		montaTela();

	}

}