nothin in particular

//global scope
DefaultTableModel model = new DefaultTableModel();
String[] colomnNames = { "First name", "Second name", "Last name",
                                     "Address", "Phone", "Age", "Gender" };

//in constructor
        model.setColumnCount(7);
        model.setColumnIdentifiers(colomnNames);
        jTable1.setEnabled(false);

//on button click
        Object[] obj = new Object[7];
        obj[0] = nameField.getText();
    // nameField.setText(""); /!!! za wsi4ki nadolu
        obj[1] = nameField1.getText();
        obj[2] = nameField2.getText();
        obj[3] = phoneField.getText();
        obj[4] = addressField.getText();
        obj[5] = ageComboBox.getSelectedItem();
        if (male.isSelected()) obj[6] = male.getText();
        else obj[6] = female.getText();
    // spiner.setValue(2);
    // combo.setSelectedIndex(0);
    // double av = (mark1 + mark2 + mark3) / 3;

        model.addRow(obj);

//other useful
        String name = f1.getText();
        String fam = f2.getText();
        if(name==null||name==""||fam==""||fam==null||
                (!radio1.isSelected() && !radio2.isSelected())){
            JOptionPane.showMessageDialog(rootPane, "Моля попълнете цялата информация",
                    "Грешка", JOptionPane.ERROR_MESSAGE);
            return;
        }

//
        private void calculate(){
        double srUspeh=0;
        int redCount=0;
        int zadCount=0;
        if(myModel.getRowCount()==0) return;
        for(int i=0;i<myModel.getRowCount()-1;i++){
            srUspeh += (Double)myModel.getValueAt(i, 2);
            if(myModel.getValueAt(i, 3).equals("Редовно")){
                redCount++;
            }
            else zadCount++;
        }
        srUspeh /= myModel.getRowCount();
        usField.setText(String.valueOf(srUspeh));
        redField.setText(String.valueOf(redCount));
        zadField.setText(String.valueOf(zadCount));
    }