JPasswordField

 

🔐 Java Swing JPasswordField – Overview & Example

JPasswordField is a subclass of JTextField in Swing used for password input. The characters are masked (e.g., shown as * or •) for security.

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✅ Key Features

Method / Property	Description
setEchoChar(char)	Sets the masking character
getPassword()	Returns the password as a char[]
setText(String)	Sets the text (not recommended for passwords)
getText()	Returns the text (deprecated for passwords)

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✅ Example: Basic Password Field

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class PasswordExample {
    public static void main(String[] args) {
        JFrame frame = new JFrame("JPasswordField Example");
        frame.setSize(300, 150);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(new FlowLayout());

        JLabel label = new JLabel("Enter Password:");
        JPasswordField passwordField = new JPasswordField(15);
        JButton button = new JButton("Submit");

        JLabel result = new JLabel();

        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                char[] password = passwordField.getPassword();
                String passString = new String(password);
                result.setText("Password: " + passString);
            }
        });

        frame.add(label);
        frame.add(passwordField);
        frame.add(button);
        frame.add(result);

        frame.setVisible(true);
    }
}

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🔒 Security Tips

• Always use getPassword() instead of getText() to avoid keeping passwords in memory longer than necessary.

• Clear the char[] array after use (Arrays.fill(password, '0');).

• Avoid storing passwords in String form if security matters.

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