JDesktop e JInternalFrame

/*
 * Main.java
 *
 * Created on 13 de Abril de 2005, 10:52
 */

/**
 *
 * @author  Rodrigo Rocha
 */
public class Main extends javax.swing.JFrame {
    Cadastro cadastro = new Cadastro();
        
    /** Creates new form Main */
    public Main() {
        initComponents();
        jDesktop.add(cadastro, javax.swing.JLayeredPane.DEFAULT_LAYER);
    }
    
    /** 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.
     */
    private void initComponents() {
        jDesktop = new javax.swing.JDesktopPane();
        jMenuBar1 = new javax.swing.JMenuBar();
        jMenu1 = new javax.swing.JMenu();
        jMenuItem1 = new javax.swing.JMenuItem();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("GESTOR");
        getContentPane().add(jDesktop, java.awt.BorderLayout.CENTER);

        jMenu1.setText("Clientes");
        jMenu1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenu1ActionPerformed(evt);
            }
        });

        jMenuItem1.setText("Cadastro");
        jMenuItem1.setName("jMcadastro");
        jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jMenuItem1ActionPerformed(evt);
            }
        });

        jMenu1.add(jMenuItem1);

        jMenuBar1.add(jMenu1);

        setJMenuBar(jMenuBar1);

        pack();
    }

    private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
      
       // TODO add your handling code here:
    }

    private void jMenu1ActionPerformed(java.awt.event.ActionEvent evt) {
        
        cadastro.setVisible(true);
        // TODO add your handling code here:
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Main().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify
    private javax.swing.JDesktopPane jDesktop;
    private javax.swing.JMenu jMenu1;
    private javax.swing.JMenuBar jMenuBar1;
    private javax.swing.JMenuItem jMenuItem1;
    // End of variables declaration
    

    
}

public class Cadastro extends javax.swing.JInternalFrame {
    
    /** Creates new form Cadastro */
    public Cadastro() {
        initComponents();
    }
    
    /** 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.
     */
    private void initComponents() {
        java.awt.GridBagConstraints gridBagConstraints;

        jLabel1 = new javax.swing.JLabel();
        jTextField1 = new javax.swing.JTextField();
        jLabel2 = new javax.swing.JLabel();
        jTextField2 = new javax.swing.JTextField();

        getContentPane().setLayout(new java.awt.GridBagLayout());

        setClosable(true);
        setIconifiable(true);
        setMaximizable(true);
        setTitle("Cadastro");
        setVisible(true);
        jLabel1.setText("Nome:");
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 0;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        getContentPane().add(jLabel1, gridBagConstraints);

        jTextField1.setName("txtNome");
        jTextField1.setPreferredSize(new java.awt.Dimension(250, 21));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 1;
        getContentPane().add(jTextField1, gridBagConstraints);

        jLabel2.setText("Endere\u00e7o:");
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 3;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        getContentPane().add(jLabel2, gridBagConstraints);

        jTextField2.setPreferredSize(new java.awt.Dimension(250, 21));
        gridBagConstraints = new java.awt.GridBagConstraints();
        gridBagConstraints.gridx = 0;
        gridBagConstraints.gridy = 4;
        gridBagConstraints.anchor = java.awt.GridBagConstraints.WEST;
        getContentPane().add(jTextField2, gridBagConstraints);

        pack();
    }
    
    
    // Variables declaration - do not modify
    private javax.swing.JLabel jLabel1;
    private javax.swing.JLabel jLabel2;
    private javax.swing.JTextField jTextField1;
    private javax.swing.JTextField jTextField2;
    // End of variables declaration
    
}