Mandar llamar a otra ventana por medio de un boton ¿como?. Mini aplicacion en NetBean

[lince_36]

Código:

/*
 * alumnos.java
 *
 * Created on 8 de marzo de 2010, 09:52 AM
 */

package desktopapplication1;
import java.sql.*;
import javax.swing.JOptionPane;
/**
 *
 * @author  ALUMNO
 */
public class alumnos extends javax.swing.JFrame {
      private Connection conn;
      private Statement sentencia;
      private ResultSet res;

    /** Creates new form alumnos */
    public alumnos() {
        initComponents();
        
      try{
            Class.forName("org.gjt.mm.mysql.Driver");
            conn=DriverManager.getConnection("jdbc:mysql://localhost/control_escolar","root","root");
            sentencia=conn.createStatement();
            JOptionPane.showMessageDialog(this,"La conexion fue correcta");
      
            
        
        }catch(Exception e){
            JOptionPane.showMessageDialog(this,e.getMessage());
        }
    }

    /** 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() {

        jButton1 = new javax.swing.JButton();
        jTextField1 = new javax.swing.JTextField();
        jTextField2 = new javax.swing.JTextField();
        jTextField3 = new javax.swing.JTextField();
        jTextField4 = new javax.swing.JTextField();
        jLabel1 = new javax.swing.JLabel();
        jLabel2 = new javax.swing.JLabel();
        jLabel3 = new javax.swing.JLabel();
        jLabel4 = new javax.swing.JLabel();
        jLabel5 = new javax.swing.JLabel();
        jLabel6 = new javax.swing.JLabel();
        jTextField5 = new javax.swing.JTextField();
        jTextField6 = new javax.swing.JTextField();
        jButton2 = new javax.swing.JButton();
        jButton3 = new javax.swing.JButton();
        jButton4 = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setName("Form"); // NOI18N

        org.jdesktop.application.ResourceMap resourceMap = org.jdesktop.application.Application.getInstance(desktopapplication1.DesktopApplication1.class).getContext().getResourceMap(alumnos.class);
        jButton1.setText(resourceMap.getString("btn_prim.text")); // NOI18N
        jButton1.setName("btn_prim"); // NOI18N
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jTextField1.setText(resourceMap.getString("Id_txt.text")); // NOI18N
        jTextField1.setName("Id_txt"); // NOI18N

        jTextField2.setText(resourceMap.getString("jTextField2.text")); // NOI18N
        jTextField2.setName("jTextField2"); // NOI18N

        jTextField3.setText(resourceMap.getString("jTextField3.text")); // NOI18N
        jTextField3.setName("jTextField3"); // NOI18N

        jTextField4.setText(resourceMap.getString("jTextField4.text")); // NOI18N
        jTextField4.setName("jTextField4"); // NOI18N

        jLabel1.setText(resourceMap.getString("jLabel1.text")); // NOI18N
        jLabel1.setName("jLabel1"); // NOI18N

        jLabel2.setText(resourceMap.getString("jLabel2.text")); // NOI18N
        jLabel2.setName("jLabel2"); // NOI18N

        jLabel3.setText(resourceMap.getString("jLabel3.text")); // NOI18N
        jLabel3.setName("jLabel3"); // NOI18N

        jLabel4.setText(resourceMap.getString("jLabel4.text")); // NOI18N
        jLabel4.setName("jLabel4"); // NOI18N

        jLabel5.setText(resourceMap.getString("jLabel5.text")); // NOI18N
        jLabel5.setName("jLabel5"); // NOI18N

        jLabel6.setText(resourceMap.getString("jLabel6.text")); // NOI18N
        jLabel6.setName("jLabel6"); // NOI18N

        jTextField5.setText(resourceMap.getString("jTextField5.text")); // NOI18N
        jTextField5.setName("jTextField5"); // NOI18N

        jTextField6.setText(resourceMap.getString("jTextField6.text")); // NOI18N
        jTextField6.setName("jTextField6"); // NOI18N

        jButton2.setText(resourceMap.getString("jButton2.text")); // NOI18N
        jButton2.setName("jButton2"); // NOI18N
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });

        jButton3.setText(resourceMap.getString("jButton3.text")); // NOI18N
        jButton3.setName("jButton3"); // NOI18N
        jButton3.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton3ActionPerformed(evt);
            }
        });

        jButton4.setText(resourceMap.getString("jButton4.text")); // NOI18N
        jButton4.setName("jButton4"); // NOI18N
        jButton4.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton4ActionPerformed(evt);
            }
        });

        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()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 53, javax.swing.GroupLayout.PREFERRED_SIZE)
                    .addComponent(jLabel2)
                    .addComponent(jLabel4)
                    .addComponent(jLabel3)
                    .addComponent(jLabel5)
                    .addComponent(jLabel6))
                .addGap(23, 23, 23)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING, false)
                    .addComponent(jTextField6)
                    .addComponent(jTextField5)
                    .addComponent(jTextField4)
                    .addComponent(jTextField2, javax.swing.GroupLayout.DEFAULT_SIZE, 172, Short.MAX_VALUE)
                    .addComponent(jTextField3)
                    .addComponent(jTextField1))
                .addGap(32, 32, 32)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addComponent(jButton2)
                    .addComponent(jButton3)
                    .addComponent(jButton1)
                    .addComponent(jButton4))
                .addContainerGap(33, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
                    .addGroup(layout.createSequentialGroup()
                        .addGap(28, 28, 28)