Como importar classe dentro de um jFrame?

[MaikeES]

Pessoal tenho um JFrame e um arquivos de classes no meu projeto gostaria de importar meu arquivo de classes para dentro do meu JFrame como posso fazer isto?

public class FrmPrincipal extends javax.swing.JFrame{

/**

* Creates new form FrmPrincipal

*/

public FrmPrincipal() {

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.

*/

@SuppressWarnings("unchecked")

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

private void initComponents() {

jMenuBar1 = new javax.swing.JMenuBar();

cadastros = new javax.swing.JMenu();

cadastroInsituicao = new javax.swing.JMenuItem();

cadastroProfessores = new javax.swing.JMenuItem();

cadastroPerguntas = new javax.swing.JMenuItem();

cadastroRespostas = new javax.swing.JMenuItem();

jMenu3 = new javax.swing.JMenu();

jMenu5 = new javax.swing.JMenu();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

jMenuBar1.setToolTipText("");

cadastros.setMnemonic('c');

cadastros.setText("Cadastros");

cadastroInsituicao.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_I, java.awt.event.InputEvent.CTRL_MASK));

cadastroInsituicao.setText("Instituições");

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

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

cadastroInsituicaoActionPerformed(evt);

}

});

cadastros.add(cadastroInsituicao);

cadastroProfessores.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_P, java.awt.event.InputEvent.CTRL_MASK));

cadastroProfessores.setText("Professores");

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

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

cadastroProfessoresActionPerformed(evt);

}

});

cadastros.add(cadastroProfessores);

cadastroPerguntas.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_Q, java.awt.event.InputEvent.CTRL_MASK));

cadastroPerguntas.setText("Perguntas");

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

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

cadastroPerguntasActionPerformed(evt);

}

});

cadastros.add(cadastroPerguntas);

cadastroRespostas.setAccelerator(javax.swing.KeyStroke.getKeyStroke(java.awt.event.KeyEvent.VK_R, java.awt.event.InputEvent.CTRL_MASK));

cadastroRespostas.setText("Respostas");

cadastros.add(cadastroRespostas);

jMenuBar1.add(cadastros);

jMenu3.setMnemonic('r');

jMenu3.setText("Resultados");

jMenu3.setMargin(new java.awt.Insets(0, 5, 0, 0));

jMenuBar1.add(jMenu3);

jMenu5.setMnemonic('s');

jMenu5.setText("Sair");

jMenu5.setMargin(new java.awt.Insets(0, 10, 0, 0));

jMenu5.addMouseListener(new java.awt.event.MouseAdapter() {

public void mouseClicked(java.awt.event.MouseEvent evt) {

jMenu5MouseClicked(evt);

}

});

jMenu5.addActionListener(new java.awt.event.ActionListener() {

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

jMenu5ActionPerformed(evt);

}

});

jMenuBar1.add(jMenu5);

setJMenuBar(jMenuBar1);

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

getContentPane().setLayout(layout);

layout.setHorizontalGroup(

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

.addGap(0, 294, Short.MAX_VALUE)

);

layout.setVerticalGroup(

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

.addGap(0, 279, Short.MAX_VALUE)

);

pack();

}// </editor-fold>

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

// TODO add your handling code here:

}

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

// TODO add your handling code here:

}

private void jMenu5ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:

}

private void jMenu5MouseClicked(java.awt.event.MouseEvent evt) {

System.exit(0);// TODO add your handling code here:

}

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

new FrmProfessores().show(); // TODO add your handling code here:

}

/**

* @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...dfeel/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(FrmPrincipal.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

} catch (InstantiationException ex) {

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

} catch (IllegalAccessException ex) {

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

} catch (javax.swing.UnsupportedLookAndFeelException ex) {

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

}

//</editor-fold>

/* Create and display the form */

java.awt.EventQueue.invokeLater(new Runnable() {

@Override

public void run() {

new FrmPrincipal().setVisible(true);

}

});

}

// Variables declaration - do not modify

private javax.swing.JMenuItem cadastroInsituicao;

private javax.swing.JMenuItem cadastroPerguntas;

private javax.swing.JMenuItem cadastroProfessores;

private javax.swing.JMenuItem cadastroRespostas;

private javax.swing.JMenu cadastros;

private javax.swing.JMenu jMenu3;

private javax.swing.JMenu jMenu5;

private javax.swing.JMenuBar jMenuBar1;

// End of variables declaration

}

public class funcao{

public static void exibir(String sTexto) {

JOptionPane.showMessageDialog(null, sTexto);

}

public static void conexaoBd(String sBanco, String sUsuario, String sSenha)

{

Connection cConexao;

try{

cConexao = DriverManager.getConnection("jdbc:mysql://localhost/"+sBanco,sUsuario,sSenha);

exibir("Conexão realizada com sucesso"); //Exibe mensagem de sucesso caso banco seja conectado

}catch(SQLException | HeadlessException e){

exibir("Sua conexão não pode ser realizada"); // exibe mensagem de erro caso classe principal não consiga ser executada

}

}

}