Vérification de remplissage de champ

svp je suis débutante en java je veux faire la vérification de remplissage de champ ??
voilà mon code
public Informationexpediteur() {
super();
initGUI();
}

private void initGUI() {
try {
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
getContentPane().setLayout(null);
{
jPanel1 = new JPanel();
getContentPane().add(jPanel1);
jPanel1.setBounds(0, 0, 950, 526);
jPanel1.setBackground(new java.awt.Color(192,192,192));
jPanel1.setLayout(null);
{
jLabel1 = new JLabel();
jPanel1.add(jLabel1);
jLabel1.setText("Expediteur : ");
jLabel1.setBounds(12, 41, 117, 22);
jLabel1.setBorder(BorderFactory.createTitledBorder(""));
jLabel1.setFont(new java.awt.Font("Segoe UI",1,14));
}
{
jLabel2 = new JLabel();
jPanel1.add(jLabel2);
jLabel2.setText("Civilité de l'expediteur");
jLabel2.setBounds(47, 69, 161, 16);
}
{
jLabel3 = new JLabel();
jPanel1.add(jLabel3);
jLabel3.setText("Prenom de l'expediteur *");
jLabel3.setBounds(47, 91, 161, 16);
}
{
jLabel4 = new JLabel();
jPanel1.add(jLabel4);
jLabel4.setText("Nom de l'expediteur *");
jLabel4.setBounds(47, 113, 161, 16);
}
{
jLabel5 = new JLabel();
jPanel1.add(jLabel5);
jLabel5.setText("Date naissance de l'expediteur");
jLabel5.setBounds(47, 135, 193, 16);
}
{
jLabel6 = new JLabel();
jPanel1.add(jLabel6);
jLabel6.setText("Adresse *");
jLabel6.setBounds(47, 157, 82, 16);
}
{
ComboBoxModel jComboBox1Model =
new DefaultComboBoxModel(
new String[] { "M","Mme","Mlle" });
jComboBox1 = new JComboBox();
jPanel1.add(jComboBox1);
jComboBox1.setModel(jComboBox1Model);
jComboBox1.setBounds(269, 58, 67, 27);
jComboBox1.setBackground(new java.awt.Color(223,220,215));
}
{
jTextField1 = new JTextField();
jPanel1.add(jTextField1);
jTextField1.setBounds(269, 110, 125, 23);
}
{
jTextField2 = new JTextField();
jPanel1.add(jTextField2);
jTextField2.setBounds(269, 88, 125, 23);
}
{
jTextField3 = new JTextField();
jPanel1.add(jTextField3);
jTextField3.setBounds(269, 132, 125, 23);
}
{
jLabel7 = new JLabel();
jPanel1.add(jLabel7);
jLabel7.setText("Code postal *");
jLabel7.setBounds(47, 257, 98, 16);
}
{
jTextField4 = new JTextField();
jPanel1.add(jTextField4);
jTextField4.setBounds(269, 246, 123, 23);
}
{
jLabel8 = new JLabel();
jPanel1.add(jLabel8);
jLabel8.setText("Ville *");
jLabel8.setBounds(47, 279, 60, 16);
}
{
jTextField5 = new JTextField();
jPanel1.add(jTextField5);
jTextField5.setBounds(269, 269, 123, 24);
}
{
jLabel9 = new JLabel();
jPanel1.add(jLabel9);
jLabel9.setText("Type de piece d'identité");
jLabel9.setBounds(47, 301, 177, 16);
}


{
jRadioButton1 = new JRadioButton();
jPanel1.add(jRadioButton1);
jRadioButton1.setText("Carte d'identité");
jRadioButton1.setBounds(269, 313, 102, 20);
}
{
jRadioButton2 = new JRadioButton();
jPanel1.add(jRadioButton2);
jRadioButton2.setText("Passeport");
jRadioButton2.setBounds(269, 297, 79, 12);
}

{
group=new ButtonGroup();
group.add(jRadioButton1);
jRadioButton1.setBackground(new java.awt.Color(192,192,192));
group.add(jRadioButton2);
jRadioButton2.setBackground(new java.awt.Color(192,192,192));
}

{
jLabel10 = new JLabel();
jPanel1.add(jLabel10);
jLabel10.setText("Numero de piéce d'identité *");
jLabel10.setBounds(47, 343, 204, 16);
}
{
jTextField6 = new JTextField();
jPanel1.add(jTextField6);
jTextField6.setBounds(269, 339, 123, 26);
}
{
jLabel11 = new JLabel();
jPanel1.add(jLabel11);
jLabel11.setText("Numéro de telephone de l'expediteur *");
jLabel11.setBounds(47, 371, 222, 16);
}
{
jTextField7 = new JTextField();
jPanel1.add(jTextField7);
jTextField7.setBounds(269, 365, 123, 22);
}

{
jButton1 = new JButton();
jPanel1.add(jButton1);
jButton1.setText("MONTANT A TRANSFERER");
jButton1.setBackground(new Color(153,0,0));
jButton1.setBounds(7, 13, 222, 23);
jButton1.setForeground(new java.awt.Color(255,255,255));
jButton1.setFont(new java.awt.Font("Segoe UI",1,14));
jButton1.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

}
});
}
{
jButton2 = new JButton();
jPanel1.add(jButton2);
jButton2.setText("INFORMATIONS EXPEDITEUR");
jButton2.setBackground(new Color(153, 0, 0));
jButton2.setBounds(240, 13, 230, 23);
jButton2.setFont(new java.awt.Font("Segoe UI",1,14));
jButton2.setForeground(new java.awt.Color(255,255,255));
jButton2.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

}
});
}
{
jButton3 = new JButton();
jPanel1.add(jButton3);
jButton3.setText("INFORMATIONS DESTINATAIRE");
jButton3.setBackground(new Color(242,242,242));
jButton3.setEnabled(false);
jButton3.setBounds(481, 13, 223, 23);
jButton3.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

}
});
}
{
jButton4 = new JButton();
jPanel1.add(jButton4);
jButton4.setText("VERIFICATION PAIEMENT");
jButton4.setBackground(new Color(242,242,242));
jButton4.setEnabled(false);
jButton4.setBounds(715, 13, 214, 23);
jButton4.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub

}
});
}
{
jScrollPane1 = new JScrollPane();
jPanel1.add(jScrollPane1);
jScrollPane1.setBounds(269, 161, 212, 79);
{
jTextArea1 = new JTextArea();
jScrollPane1.setViewportView(jTextArea1);
jTextArea1.setBounds(511, 166, 200, 91);
}
}
{
btnDate = new JDateChooser();
jPanel1.add(btnDate);
btnDate.setBounds(400, 132, 159, 23);

}
{
jButton7 = new JButton();
jPanel1.add(jButton7);
jButton7.setText("Valider");
jButton7.setIcon(new ImageIcon(getClass().getClassLoader().getResource("check.png")));
jButton7.setBounds(673, 365, 135, 37);
jButton7.setFont(new java.awt.Font("Segoe UI",1,12));
jButton7.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
Informationsdestinataire windowInfodest = new Informationsdestinataire();
windowInfodest.setVisible(true);
windowInfodest.setLocationRelativeTo(null);
dispose();


}
});
}
{
jButton5 = new JButton();
jPanel1.add(jButton5);
jButton5.setText("Etape précédente");
jButton5.setIcon(new ImageIcon(getClass().getClassLoader().getResource("back.png")));
jButton5.setBounds(30, 396, 178, 36);
jButton5.setFont(new java.awt.Font("Segoe UI",1,12));
jButton5.addActionListener(new ActionListener() {

@Override
public void actionPerformed(ActionEvent arg0) {
Montantdutransfert windowmontant = new Montantdutransfert();
windowmontant.setVisible(true);
windowmontant.setLocationRelativeTo(null);
dispose();



}
});
}

}
pack();
this.setSize(966, 564);
} catch (Exception e) {
//add your error handling code here
e.printStackTrace();
}
}

}