Use the same jFormattedTextField for CPF and CNPJ mask

Question

I wonder if it’s possible in one JFormattedTextField, toggle mask for CPF and CNPJ.

When I wear the mask of JFormattedTextField the value is already static, and if put to the CPF, It will not fit the CNPJ and if you put in the standard CNPJ, the CPF will be disfigured.

What I’ve been trying to do are 2 checkboxes, each with their respective distinction and when selected, apply the correct mask.

But it is not cleaning, after I select some mask. The code to insert the mask I am using is:

if (jCheckBox1.isSelected()) {
    try {
        MaskFormatter format = new MaskFormatter("##.###.###/####-##");
        format.install(jFormattedTextField1);
    } catch (ParseException ex) {
        Logger.getLogger(FormTeste.class.getName()).log(Level.SEVERE, null, ex);
    }
}

Answer 1

You want to change at runtime the field mask, only the install apparently does not work, but according to that answer, you need to change by the call of setFormatterFactory(), where necessary. In your example, I would suggest changing to JRadioButton to avoid risk of conflict of masks.

You create a group, add the radiobuttons on it, this way, you can only select one item at a time, avoiding the problem mentioned in the previous paragraph.

ButtonGroup radioGroup = new ButtonGroup();
radioGroup.add(radioButtonCPF);
radioGroup.add(radioButtonCNPJ);

It is also interesting to create the masks before wearing them, so that the treatment of the exception of the ParseException occur only once.

private MaskFormatter CNPJMask;
private MaskFormatter CPFMask;

//...

try {
    CNPJMask = new MaskFormatter("##.###.###/####-##");
    CPFMask = new MaskFormatter("###.###.###-##");
} catch (ParseException ex) {
    ex.printStackTrace();
}

Then just add one ItemListener in each RadioButton, and within the intemStateChanged, check if he’s been checked:

    radioButtonCPF.addItemListener(new ItemListener() {
        @Override
        public void itemStateChanged(ItemEvent e) {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                fmtField.setValue(null);
                fmtField.setFormatterFactory(new DefaultFormatterFactory(CPFMask));
            }
        }
    });

    radioButtonCNPJ.addItemListener(new ItemListener() {
        @Override
        public void itemStateChanged(ItemEvent e) {
            if (e.getStateChange() == ItemEvent.SELECTED) {
                fmtField.setValue(null);
                fmtField.setFormatterFactory(new DefaultFormatterFactory(CNPJMask));
            }
        }
    });

The fmtField.setValue(null); need to be called before applying the mask, because if you have any content in the field, the exchange is not performed. The consequence of this is that each time the exchange is made, what was typed will be lost.

You can improve, but the above is already well simplified.

---

Here’s an executable example of the masking app if you want to see it working before you change your code:

import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.text.ParseException;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.ButtonGroup;
import javax.swing.JFormattedTextField;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JRadioButton;
import javax.swing.border.EmptyBorder;
import javax.swing.text.DefaultFormatterFactory;
import javax.swing.text.MaskFormatter;

public class ChoiceMaskTextFormattedFieldTest extends JFrame {

    private static final long serialVersionUID = 1L;
    private JPanel contentPane;
    private JFormattedTextField fmtField;
    private JRadioButton radioButtonCNPJ;
    private JRadioButton radioButtonCPF;
    private MaskFormatter CNPJMask;
    private MaskFormatter CPFMask;

    public static void main(String[] args) {
        EventQueue.invokeLater(() -> {
            new ChoiceMaskTextFormattedFieldTest().setVisible(true);
        });
    }

    public ChoiceMaskTextFormattedFieldTest() {
        initComponents();
    }

    public void initComponents() {

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setPreferredSize(new Dimension(190, 250));
        contentPane = new JPanel();
        contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
        setContentPane(contentPane);
        contentPane.setLayout(new BoxLayout(contentPane, BoxLayout.Y_AXIS));

        fmtField = new JFormattedTextField();
        radioButtonCPF = new JRadioButton();

        radioButtonCNPJ = new JRadioButton();

        radioButtonCPF.setText("CPF");
        radioButtonCNPJ.setText("CNPJ");

        // adiciona os radiobuttons no groupbutton
        // pra que apenas um seja selecionavel
        ButtonGroup radioGroup = new ButtonGroup();
        radioGroup.add(radioButtonCPF);
        radioGroup.add(radioButtonCNPJ);

        // cria as mascaras e já a deixa pronta pra uso
        try {
            CNPJMask = new MaskFormatter("##.###.###/####-##");
            CPFMask = new MaskFormatter("###.###.###-##");
        } catch (ParseException ex) {
            ex.printStackTrace();
        }

        // adiciona um listener aos radiobuttons
        radioButtonCPF.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    fmtField.setValue(null);
                    fmtField.setFormatterFactory(new DefaultFormatterFactory(CPFMask));
                }
            }
        });

        radioButtonCNPJ.addItemListener(new ItemListener() {
            @Override
            public void itemStateChanged(ItemEvent e) {
                if (e.getStateChange() == ItemEvent.SELECTED) {
                    fmtField.setValue(null);
                    fmtField.setFormatterFactory(new DefaultFormatterFactory(CNPJMask));
                }
            }
        });

        contentPane.add(fmtField);
        contentPane.add(Box.createVerticalStrut(30));
        contentPane.add(radioButtonCPF);
        contentPane.add(radioButtonCNPJ);
        contentPane.add(Box.createVerticalStrut(100));
        pack();
    }
}