Add text masking functionality to Android EditText. It will prevent user from inserting not allowed signs, and format input as well.

An Android Library to format Strings usings masks. Can be used with TextWatcher.

Mascaras para trabalhar com componentes JavaFX

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Dependency free text formatter for your input masking needs

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Praticando as bibliotecas javax.swing, java.awt e MaskFormatter.

import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.text.ParseException; import javax.swing.BoxLayout; import javax.swing.JButton; import javax.swing.JFormattedTextField; import javax.swing.JFrame; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.SwingUtilities; import javax.swing.text.MaskFormatter; final class ATMDemo extends JFrame implements ActionListener{ private static final long serialVersionUID = -8099290319139531183L; private final JFormattedTextField textField; private final JPanel layerOne; private final JPanel layerTwo; private final JPanel layerThree; private final JPanel layerFour; private final JPanel layerFive; private final JPanel layerSix; private final JButton one; private final JButton two; private final JButton three; private final JButton four; private final JButton five; private final JButton six; private final JButton seven; private final JButton eight; private final JButton nine; private final JButton zero; private final JButton okButton; private final JButton clearButton; private ATMDemo() throws ParseException{ super("ATM Demo"); getContentPane().setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS)); setDefaultCloseOperation(EXIT_ON_CLOSE); layerOne = new JPanel(); layerTwo = new JPanel(); layerThree = new JPanel(); layerFour = new JPanel(); layerFive = new JPanel(); layerSix = new JPanel(); // Add layer one textField = new JFormattedTextField(new MaskFormatter("*********")); textField.setEditable(false); textField.setColumns(7); layerOne.add(textField); // Add layer two one = new JButton(String.valueOf(1)); two = new JButton(String.valueOf(2)); three = new JButton(String.valueOf(3)); layerTwo.add(one); layerTwo.add(two); layerTwo.add(three); // Add layer three four = new JButton(String.valueOf(4)); five = new JButton(String.valueOf(5)); six = new JButton(String.valueOf(6)); layerThree.add(four); layerThree.add(five); layerThree.add(six); // Add layer four seven = new JButton(String.valueOf(7)); eight = new JButton(String.valueOf(8)); nine = new JButton(String.valueOf(9)); layerFour.add(seven); layerFour.add(eight); layerFour.add(nine); // Add layer five zero = new JButton(String.valueOf(0)); layerFive.add(zero); // Add layer six okButton = new JButton("OK"); clearButton = new JButton("Clear"); layerSix.add(okButton); layerSix.add(clearButton); } @Override public final void actionPerformed(final ActionEvent e) { final JButton source = (JButton)e.getSource(); if(source.equals(okButton)){ if(textField.getValue() != null && textField.getValue().toString().length() != 9){ JOptionPane.showMessageDialog(this, "Invalid PIN length - must be 9 digits long.", "Error", JOptionPane.ERROR_MESSAGE); } else{ JOptionPane.showMessageDialog(this, "Valid PIN length.", "Valid", JOptionPane.INFORMATION_MESSAGE); } clearButton.doClick(); } else if(source.equals(clearButton)){ textField.setValue(null); } else{ final StringBuilder sb = new StringBuilder(); if(textField.getValue() != null){ for(char c: textField.getValue().toString().toCharArray()){ sb.append(c); } } if(sb.length() != 9){ sb.append(source.getText()); textField.setValue(sb); } } } static final ATMDemo newInstance() throws ParseException{ final ATMDemo demo = new ATMDemo(); demo.one.addActionListener(demo); demo.two.addActionListener(demo); demo.three.addActionListener(demo); demo.four.addActionListener(demo); demo.five.addActionListener(demo); demo.six.addActionListener(demo); demo.seven.addActionListener(demo); demo.eight.addActionListener(demo); demo.nine.addActionListener(demo); demo.zero.addActionListener(demo); demo.okButton.addActionListener(demo); demo.clearButton.addActionListener(demo); demo.add(demo.layerOne); demo.add(demo.layerTwo); demo.add(demo.layerThree); demo.add(demo.layerFour); demo.add(demo.layerFive); demo.add(demo.layerSix); demo.setSize(225, 250); demo.setLocationRelativeTo(null); return demo; } public static final void main(final String[] args) { SwingUtilities.invokeLater(new Runnable(){ @Override public void run() { try { ATMDemo.newInstance().setVisible(true); } catch (ParseException e) { e.printStackTrace(); } } }); } }