Programa em Java para criar Chaves

 layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addContainerGap()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jLabel3, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jLabel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
                .addGap(31, 31, 31)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jLabel1)
                    .addComponent(quantidade, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(gerar)
                    .addComponent(letrasChk)
                    .addComponent(simbolosChk)
                    .addComponent(numerosChk))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(exportarParaBD)
                    .addComponent(exportarParaTxt))
                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
                .addComponent(jScrollPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 218, Short.MAX_VALUE)
                .addContainerGap())
        );

        pack();
        setLocationRelativeTo(null);
    }// </editor-fold>                        

    private void letrasChkActionPerformed(java.awt.event.ActionEvent evt) {                                          
        // TODO add your handling code here:
    }                                         

    private Metodos metodos;
    private ArrayList<String> lista;
    private void gerarActionPerformed(java.awt.event.ActionEvent evt) {                                      
        metodos = new Metodos();
        lista = metodos.getLista();
        boolean c = letrasChk.isSelected();
        boolean n = numerosChk.isSelected();
        boolean s = simbolosChk.isSelected();
        try {
            metodos.gerarChave(quantidade.getValue().hashCode(), c, n, s);
        } catch (Exception e) {
            JOptionPane.showMessageDialog(null, "Você precisa selecionar pelo menos um tipo de caracter!");
        }

        DefaultTableModel modelo = (DefaultTableModel) listaTbl.getModel();
        try {
            modelo.setNumRows(0);
            lista.forEach((ch) -> {
                modelo.addRow(new Object[]{
                    lista.indexOf(ch) + 1,
                    ch
                });
            });
        } catch (Exception e) {
            System.err.println(e.getMessage());
        }
    }                                     
    private String nomeDaTabela = "Erro";
    private String dia = "Erro";
    private int mes = 0;
    private int ano = 0;
    private void exportarParaBDActionPerformed(java.awt.event.ActionEvent evt) {                                               
        nomeDaTabela = JOptionPane.showInputDialog(null, "Digite a tabela do Servidor:");
        dia = JOptionPane.showInputDialog(null, "Qual dia de vencimento?");
        mes = Integer.parseInt(JOptionPane.showInputDialog(null, "A partir de qual mês contar?"));
        ano = Integer.parseInt(JOptionPane.showInputDialog(null, "A partir de qual ano contar?"));
        ConexaoUtil conexaoUtil = new ConexaoUtil();

        for (int i = 0; i < quantidade.getValue().hashCode(); i++) {
            try {
                Connection con = conexaoUtil.getInstanec().getConnection();
                String chave = lista.get(i);
                String query = "INSERT INTO " + nomeDaTabela + " (id_Chave, chave, dia, mes, ano, situacao) VALUES ( ?, ?, ?, ?, ?, ?)";
                PreparedStatement stmt = con.prepareStatement(query);
                stmt.setString(1, null);
                stmt.setString(2, chave);
                stmt.setString(3, dia);
                stmt.setInt(4, mes);
                stmt.setInt(5, ano);
                stmt.setString(6, "ativo");
                stmt.execute();
                mes++;
                if (mes == 12) {
                    mes = 1;
                    ano++;
                }
                con.close();
            } catch (Exception e) {
                System.err.println(e.getMessage());
            }
        }
    }                                              

    private void exportarParaTxtActionPerformed(java.awt.event.ActionEvent evt) {                                                
        BufferedWriter buffWrite;
        File file = new File("C:/tmp");
        file.mkdirs();
        try {
            buffWrite = new BufferedWriter(new FileWriter(file.getAbsolutePath()+"/script.txt"));
            nomeDaTabela = JOptionPane.showInputDialog(null, "Digite a tabela do Servidor:");
            dia = JOptionPane.showInputDialog(null, "Qual dia de vencimento?");
            mes = Integer.parseInt(JOptionPane.showInputDialog(null, "A partir de qual mês contar?"));
            ano = Integer.parseInt(JOptionPane.showInputDialog(null, "A partir de qual ano contar?"));

            for (int i = 0; i < quantidade.getValue().hashCode(); i++) {
                String chave = lista.get(i);
                String query = "INSERT INTO " + nomeDaTabela + " (id_Chave, chave, dia, mes, ano, situacao) "
                        + "VALUES (null, " + chave + ", " + dia + ", " + mes + ", " + ano + ", ativo)";
                buffWrite.append(query + "\\r\\n");
                mes++;
                if(mes >= 12){
                    mes = 1;
                    ano++;
                }
                
            }
            buffWrite.close();

        } catch (IOException ex) {
            Logger.getLogger(View.class.getName()).log(Level.SEVERE, null, ex);
        }

    }                                               

    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html 
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Nimbus".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(View.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //</editor-fold>