I have a problem when I am trying to get the size of a JFormattedTextField. Actually I need the user to enter a simple pinCode, and then get the size of what he enters to loop on it right after it. If he entered 4 digits it's ok, or else he has to do it again. But when I run my project, I have an infinite loop with "Pin must be 4 digits"...
I already found this link, but it did not fix my problem.
Here's my code :
package codePin;
import java.io.*;
import java.text.NumberFormat;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Main extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel container = new JPanel();
private JFormattedTextField jtf = new JFormattedTextField(NumberFormat.getIntegerInstance());
private JLabel label = new JLabel("Enter Pin: ");
private JButton b = new JButton("OK");
public Main() {
this.setTitle("APP");
this.setSize(300, 500);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
container.setBackground(Color.white);
container.setLayout(new BorderLayout());
JPanel top = new JPanel();
Font police = new Font("Arial", Font.BOLD, 14);
jtf.setFont(police);
jtf.setPreferredSize(new Dimension(150, 30));
jtf.setForeground(Color.BLUE);
b.addActionListener(new BoutonListener());
top.add(label);
top.add(jtf);
top.add(b);
this.setContentPane(top);
this.setVisible(true);
}
class BoutonListener implements ActionListener {
public void actionPerformed(ActionEvent e) {
int nbTry = 0;
boolean authenticated = false;
do {
do {
if (jtf.getText().length() != 4) {
System.out.println("Pin must be 4 digits");
} else {
System.out.println("Checking...");
}
ArrayList<Integer> pins = new ArrayList<Integer>();
readPinsData(new File("bdd.txt"), pins);
String[] thePins = new String[pins.size()];
for (int i = 0; i < thePins.length; i++) {
thePins[i] = pins.get(i).toString();
}
String passEntered = String.valueOf(jtf);
for (int i = 0; i < thePins.length; i++) {
if (passEntered.equals(thePins[i]) && jtf.getText().length() == 4) {
System.out.println(":)");
authenticated = true;
break;
}
}
} while (jtf.getText().length() != 4);
if (!authenticated && jtf.getText().length() == 4) {
System.out.println(":(");
nbTry++;
}
} while (nbTry < 3 && !authenticated);
//System.out.println("TEXT : jtf " + jtf.getText());
}
}
// Function to read/access my pins database (file bdd.txt)
static public boolean readPinsData(File dataFile, ArrayList<Integer> data) {
boolean err = false;
try {
Scanner scanner = new Scanner(dataFile);
String line;
while (scanner.hasNext()) {
line = scanner.nextLine();
try {
data.add(Integer.parseInt(line));
} catch (NumberFormatException e) {
e.printStackTrace();
err = true;
}
}
scanner.close();
} catch (FileNotFoundException e) {
e.printStackTrace();
err = true;
}
return err;
}
public static void main(String[] args) {
Main fen = new Main();
}
}
bdd.txt :
1111
1234
2222
3333
4444
5555
6666
7777
8888
9999
How can I do that ? Any ideas ?
Thanks, Florent.
None of the answers actually work. Short answer, you have to do the following check:
if (jtf.getText().replaceAll("\u00A0","").length() != 4) {
System.out.println("Pin must be 4 digits");
JOptionPane.showMessageDialog(null,"Pin must be 4 digits");
return;
}
Explanation: the unicode character \u0160 which is used in the NumberFormat is not a non-breaking space. After the \u there must be the hexadecimal representation of the character, that is \u00A0.
Complete code:
package codePin;
import java.io.*;
import java.text.NumberFormat;
import java.util.*;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.concurrent.atomic.AtomicInteger;
public class Main extends JFrame {
private static final long serialVersionUID = 1L;
private JPanel container = new JPanel();
private JFormattedTextField jtf = new JFormattedTextField(NumberFormat.getIntegerInstance());
private JLabel label = new JLabel("Enter Pin: ");
private JButton b = new JButton("OK");
public Main() {
this.setTitle("APP");
this.setSize(300, 500);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setLocationRelativeTo(null);
container.setBackground(Color.white);
container.setLayout(new BorderLayout());
JPanel top = new JPanel();
Font police = new Font("Arial", Font.BOLD, 14);
jtf.setFont(police);
jtf.setPreferredSize(new Dimension(150, 30));
jtf.setForeground(Color.BLUE);
b.addActionListener(new BoutonListener());
top.add(label);
top.add(jtf);
top.add(b);
this.setContentPane(top);
this.setVisible(true);
}
class BoutonListener implements ActionListener {
private final AtomicInteger nbTry = new AtomicInteger(0);
ArrayList<Integer> pins = readPinsData("bdd.txt");
public void actionPerformed(ActionEvent e) {
if (nbTry.get() > 2) {
JOptionPane.showMessageDialog(null, "Number of tries exceeded");
return;
}
final String passEntered=jtf.getText().replaceAll("\u00A0", "");
if (passEntered.length() != 4) {
System.out.println("Pin must be 4 digits");
JOptionPane.showMessageDialog(null, "Ping must be 4 digits");
return;
}
System.out.println("Checking...");
SwingWorker worker = new SwingWorker<Void, Void>() {
@Override
protected Void doInBackground() throws Exception {
boolean authenticated = false;
if (pins.contains(Integer.parseInt(passEntered))) {
System.out.println(":)");
authenticated = true;
}
if (!authenticated) {
System.out.println(":(");
nbTry.incrementAndGet();
}
return null;
}
};
worker.execute();
}
}
// Function to read/access my pins database (file bdd.txt)
static public ArrayList<Integer> readPinsData(String dataFile) {
final ArrayList<Integer> data=new ArrayList<Integer>();
try {
BufferedReader reader = new BufferedReader(new FileReader(new File(dataFile)));
String line;
try {
while ((line = reader.readLine()) != null) {
try {
data.add(Integer.parseInt(line));
} catch (NumberFormatException e) {
e.printStackTrace();
System.err.printf("error parsing line '%s'\n", line);
}
}
} finally {
reader.close();
}
} catch (Exception e) {
e.printStackTrace();
System.err.println("error:"+e.getMessage());
}
return data;
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
Main fen = new Main();
}
});
}
}