Java - Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

	at Ventana.queryjtable(Ventana.java:374)

	at Ventana.btnenviarActionPerformed(Ventana.java:354)

	at Ventana$5.actionPerformed(Ventana.java:117)

	at java.desktop/javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1967)

	at java.desktop/javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2308)

	at java.desktop/javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:405)

	at java.desktop/javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:262)

	at java.desktop/javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:279)

	at java.desktop/java.awt.Component.processMouseEvent(Component.java:6631)

	at java.desktop/javax.swing.JComponent.processMouseEvent(JComponent.java:3342)

	at java.desktop/java.awt.Component.processEvent(Component.java:6396)

	at java.desktop/java.awt.Container.processEvent(Container.java:2263)

	at java.desktop/java.awt.Component.dispatchEventImpl(Component.java:5007)

	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2321)

	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4839)

	at java.desktop/java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4918)

	at java.desktop/java.awt.LightweightDispatcher.processMouseEvent(Container.java:4547)

	at java.desktop/java.awt.LightweightDispatcher.dispatchEvent(Container.java:4488)

	at java.desktop/java.awt.Container.dispatchEventImpl(Container.java:2307)

	at java.desktop/java.awt.Window.dispatchEventImpl(Window.java:2772)

	at java.desktop/java.awt.Component.dispatchEvent(Component.java:4839)

	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:772)

	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:721)

	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:715)

	at java.base/java.security.AccessController.doPrivileged(Native Method)

	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)

	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:95)

	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:745)

	at java.desktop/java.awt.EventQueue$5.run(EventQueue.java:743)

	at java.base/java.security.AccessController.doPrivileged(Native Method)

	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:85)

	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)

	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)

	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)

	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)

	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)

	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)

	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

import java.sql.Statement;

import java.sql.Connection;

import java.sql.ResultSet;

import java.sql.SQLException;

import java.util.Arrays;

import javax.swing.table.DefaultTableModel;

public class Ventana extends javax.swing.JFrame {

    private conexion mysql= new conexion();

    private Connection con=(Connection) mysql.conectar();

    private String queryJTable="";

    DefaultTableModel dtm;

    public Ventana() {

        initComponents();

         dtm = (DefaultTableModel) tabla.getModel();

        txtpreciodiario.setEditable(false);

    }

    /**

     * This method is called from within the constructor to initialize the form.

     * WARNING: Do NOT modify this code. The content of this method is always

     * regenerated by the Form Editor.

     */

    @SuppressWarnings("unchecked")

    // <editor-fold defaultstate="collapsed" desc="Generated Code">

    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();

        jLabel1 = new javax.swing.JLabel();

        jLabel2 = new javax.swing.JLabel();

        jLabel3 = new javax.swing.JLabel();

        jScrollPane1 = new javax.swing.JScrollPane();

        txtcaracteristicas = new javax.swing.JTextArea();

        jLabel4 = new javax.swing.JLabel();

        jScrollPane2 = new javax.swing.JScrollPane();

        txtdescripcion = new javax.swing.JTextArea();

        jLabel5 = new javax.swing.JLabel();

        txtnumero = new javax.swing.JTextField();

        txtpreciodiario = new javax.swing.JTextField();

        jLabel6 = new javax.swing.JLabel();

        txtestado = new javax.swing.JComboBox<>();

        jLabel7 = new javax.swing.JLabel();

        txttipohabitacion = new javax.swing.JComboBox<>();

        jTextField4 = new javax.swing.JTextField();

        jTextField6 = new javax.swing.JTextField();

        txtpiso = new javax.swing.JSpinner();

        btnenviar = new javax.swing.JButton();

        jPanel2 = new javax.swing.JPanel();

        jLabel8 = new javax.swing.JLabel();

        jTextField11 = new javax.swing.JTextField();

        jTextField12 = new javax.swing.JTextField();

        jTextField13 = new javax.swing.JTextField();

        jTextField14 = new javax.swing.JTextField();

        jScrollPane4 = new javax.swing.JScrollPane();

        tabla = new javax.swing.JTable();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jLabel1.setText("Piso:");

        jLabel2.setText("Número:");

        jLabel3.setText("Descripción:");

        txtcaracteristicas.setColumns(20);

        txtcaracteristicas.setRows(5);

        jScrollPane1.setViewportView(txtcaracteristicas);

        jLabel4.setText("Características");

        txtdescripcion.setColumns(20);

        txtdescripcion.setRows(5);

        jScrollPane2.setViewportView(txtdescripcion);

        jLabel5.setText("Precio Diario:");

        txtnumero.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                txtnumeroActionPerformed(evt);

            }

        });

        txtpreciodiario.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                txtpreciodiarioActionPerformed(evt);

            }

        });

        jLabel6.setText("Estado:");

        txtestado.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));

        jLabel7.setText("Tipo Habitación:");

        txttipohabitacion.setModel(new javax.swing.DefaultComboBoxModel<>(new String[] { "Item 1", "Item 2", "Item 3", "Item 4" }));

        jTextField4.setText("Nuevo");

        jTextField4.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                jTextField4ActionPerformed(evt);

            }

        });

        jTextField6.setText("Cancelar");

        jTextField6.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                jTextField6ActionPerformed(evt);

            }

        });

        btnenviar.setText("Enviar");

        btnenviar.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                btnenviarActionPerformed(evt);

            }

        });

        javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);

        jPanel1.setLayout(jPanel1Layout);

        jPanel1Layout.setHorizontalGroup(

            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel1Layout.createSequentialGroup()

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)

                    .addGroup(jPanel1Layout.createSequentialGroup()

                        .addContainerGap()

                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                            .addComponent(jLabel1)

                            .addComponent(jLabel2)

                            .addComponent(jLabel3)

                            .addComponent(jLabel4)

                            .addComponent(jLabel5)

                            .addComponent(jLabel6)

                            .addComponent(jLabel7))

                        .addGap(52, 52, 52)

                        .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                            .addComponent(txttipohabitacion, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(txtestado, javax.swing.GroupLayout.PREFERRED_SIZE, 129, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(txtnumero, javax.swing.GroupLayout.PREFERRED_SIZE, 199, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(txtpreciodiario, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 189, javax.swing.GroupLayout.PREFERRED_SIZE)

                            .addComponent(txtpiso, javax.swing.GroupLayout.PREFERRED_SIZE, 95, javax.swing.GroupLayout.PREFERRED_SIZE)))

                    .addGroup(jPanel1Layout.createSequentialGroup()

                        .addGap(48, 48, 48)

                        .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)

                        .addGap(39, 39, 39)

                        .addComponent(btnenviar)

                        .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                        .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)

                        .addGap(11, 11, 11)))

                .addGap(0, 17, Short.MAX_VALUE))

        );

        jPanel1Layout.setVerticalGroup(

            jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel1Layout.createSequentialGroup()

                .addGap(30, 30, 30)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(jLabel2)

                    .addComponent(txtnumero, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addGap(18, 18, 18)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(jLabel1)

                    .addComponent(txtpiso, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addGroup(jPanel1Layout.createSequentialGroup()

                        .addComponent(jLabel3)

                        .addGap(74, 74, 74))

                    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel1Layout.createSequentialGroup()

                        .addComponent(jScrollPane2, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE)

                        .addGap(18, 18, 18)))

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addComponent(jLabel4)

                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 61, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(txtpreciodiario, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(jLabel5))

                .addGap(26, 26, 26)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(jLabel6)

                    .addComponent(txtestado, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addGap(18, 18, 18)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

                    .addComponent(jLabel7)

                    .addComponent(txttipohabitacion, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addGap(29, 29, 29)

                .addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(jTextField6, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(jTextField4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(btnenviar))

                .addContainerGap(122, Short.MAX_VALUE))

        );

        jLabel8.setText("Buscar:");

        jTextField11.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                jTextField11ActionPerformed(evt);

            }

        });

        jTextField12.setText("Buscar");

        jTextField12.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                jTextField12ActionPerformed(evt);

            }

        });

        jTextField13.setText("Eliminar");

        jTextField13.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                jTextField13ActionPerformed(evt);

            }

        });

        jTextField14.setText("Salir");

        jTextField14.addActionListener(new java.awt.event.ActionListener() {

            public void actionPerformed(java.awt.event.ActionEvent evt) {

                jTextField14ActionPerformed(evt);

            }

        });

        tabla.setModel(new javax.swing.table.DefaultTableModel(

            new Object [][] {

            },

            new String [] {

                "Numero", "Piso", "Descripcion", "Caracteristicas", "Precio diario", "estado", "Tipo habitacion"

            }

        ));

        jScrollPane4.setViewportView(tabla);

        javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);

        jPanel2.setLayout(jPanel2Layout);

        jPanel2Layout.setHorizontalGroup(

            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel2Layout.createSequentialGroup()

                .addContainerGap()

                .addComponent(jLabel8)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, 93, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addGap(18, 18, 18)

                .addComponent(jTextField12, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addComponent(jTextField13, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addComponent(jTextField14, javax.swing.GroupLayout.PREFERRED_SIZE, 62, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, jPanel2Layout.createSequentialGroup()

                .addGap(0, 0, Short.MAX_VALUE)

                .addComponent(jScrollPane4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        );

        jPanel2Layout.setVerticalGroup(

            jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(jPanel2Layout.createSequentialGroup()

                .addGap(28, 28, 28)

                .addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)

                    .addComponent(jLabel8)

                    .addComponent(jTextField11, javax.swing.GroupLayout.PREFERRED_SIZE, 20, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(jTextField12, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(jTextField13, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                    .addComponent(jTextField14, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

                .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)

                .addComponent(jScrollPane4, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

        );

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

        getContentPane().setLayout(layout);

        layout.setHorizontalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(layout.createSequentialGroup()

                .addContainerGap()

                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addGap(48, 48, 48)

                .addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)

                .addContainerGap(69, Short.MAX_VALUE))

        );

        layout.setVerticalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(layout.createSequentialGroup()

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)

                    .addComponent(jPanel2, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

                    .addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

                .addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))

        );

        pack();

    }// </editor-fold>

    private void txtnumeroActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void txtpreciodiarioActionPerformed(java.awt.event.ActionEvent evt) {

    }

    private void jTextField4ActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void jTextField6ActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void jTextField14ActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void jTextField13ActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void jTextField12ActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void jTextField11ActionPerformed(java.awt.event.ActionEvent evt) {

        // TODO add your handling code here:

    }

    private void btnenviarActionPerformed(java.awt.event.ActionEvent evt) {

        dtm = (DefaultTableModel) tabla.getModel();

        var numero = txtnumero.getText();

        int valor = (Integer)txtpiso.getValue();

        var descripcion = txtdescripcion.getText();

        var caracteristicas = txtcaracteristicas.getText();

        var preciodiario = txtpreciodiario.getText();

        String estado = (String) txtestado.getSelectedItem();

        String tipohabitacion = (String) txttipohabitacion.getSelectedItem();

        int totalprecio = valor * 150;

        var totalpreciostring = Integer.toString(totalprecio);

        txtpreciodiario.setText(totalpreciostring);

        String[] datos= new String[7];

        datos[0]= numero;

        datos[1]= Integer.toString(valor);

        datos[2]= descripcion;

        datos[3]= caracteristicas;

        datos[4]= preciodiario;

        datos[5]= estado;

        datos[6]= tipohabitacion;

        System.out.println("datos = " + Arrays.toString(datos));

        dtm.addRow(datos);

        queryjtable();

    }

    private void queryjtable(){

        String [] titulos = {"ID", "Numero", "Piso", "Descripcion", "Caracteristicas", "Precio diario", "Estado", "Tipo de habitacion"};

        dtm = new DefaultTableModel(null, titulos);

        String [] registros = new String[7];

        queryJTable="Select * from habitacion";

        try {

            Statement st=(Statement) con.createStatement();

            ResultSet rs = st.executeQuery(queryJTable);

            while(rs.next()){

                registros[1]= rs.getString("numero");

                registros[2]= rs.getString("piso");

                registros[3]= rs.getString("descripcion");

                registros[4]= rs.getString("caracteristicas");

                registros[5]= rs.getString("precio_diario");

                registros[6]= rs.getString("estado");

                registros[7]= rs.getString("tipos_habitacion");

            }

        } catch (SQLException e) {

        }

}

    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 | InstantiationException | IllegalAccessException | javax.swing.UnsupportedLookAndFeelException ex) {

            java.util.logging.Logger.getLogger(Ventana.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        }

        //</editor-fold>

        //</editor-fold>

        /* Create and display the form */

        java.awt.EventQueue.invokeLater(() -> {

            new Ventana().setVisible(true);

        });

    }

    // Variables declaration - do not modify

    private javax.swing.JButton btnenviar;

    private javax.swing.JLabel jLabel1;

    private javax.swing.JLabel jLabel2;

    private javax.swing.JLabel jLabel3;

    private javax.swing.JLabel jLabel4;

    private javax.swing.JLabel jLabel5;

    private javax.swing.JLabel jLabel6;

    private javax.swing.JLabel jLabel7;

    private javax.swing.JLabel jLabel8;

    private javax.swing.JPanel jPanel1;

    private javax.swing.JPanel jPanel2;

    private javax.swing.JScrollPane jScrollPane1;

    private javax.swing.JScrollPane jScrollPane2;

    private javax.swing.JScrollPane jScrollPane4;

    private javax.swing.JTextField jTextField11;

    private javax.swing.JTextField jTextField12;

    private javax.swing.JTextField jTextField13;

    private javax.swing.JTextField jTextField14;

    private javax.swing.JTextField jTextField4;

    private javax.swing.JTextField jTextField6;

    private javax.swing.JTable tabla;

    private javax.swing.JTextArea txtcaracteristicas;

    private javax.swing.JTextArea txtdescripcion;

    private javax.swing.JComboBox<String> txtestado;

    private javax.swing.JTextField txtnumero;

    private javax.swing.JSpinner txtpiso;

    private javax.swing.JTextField txtpreciodiario;

    private javax.swing.JComboBox<String> txttipohabitacion;

    // End of variables declaration

}

import java.sql.Connection;

import java.sql.DriverManager;

import java.sql.SQLException;

/*

 * To change this license header, choose License Headers in Project Properties.

 * To change this template file, choose Tools | Templates

 * and open the template in the editor.

 */

/**

 *

 * @author Angel

 */

public class conexion {

    public static String url = "jdbc:mysql://localhost:3306/basereserva";

    public static String usuario = "root";

    public static String  contraseña = "";

    public conexion(){

    }

    public static Connection conectar(){

            Connection conexion=null;

        try {

                    Class.forName("com.mysql.cj.jdbc.Driver");

                    conexion = (Connection) DriverManager.getConnection(url, usuario, contraseña);

            } catch (ClassNotFoundException | SQLException e) {

            System.out.println(e);

        }

        return null;

    }

}