A sample code for using password field in java?

Answer 1

We'll look at a simple program which displays a small window containing only a JPasswordField object. When you press the Enter key while editing the password field, we'll print out the password and then change what character is used to mask it.

final JFrame frame = new JFrame("Password Test Frame");

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

final JPasswordField passfield = new JPasswordField();

passfield.addActionListener(new ActionListener() {

// When we press the Enter key, do some stuff to passfield...

public final void actionPerformed(final ActionEvent ev) {

// Print out the underlying password.

System.out.println(new String(passfield.getPassword()));

// Change the character used to mask the password.

passfield.setEchoChar((char) (passfield.getEchoChar() + 1));

}

});

frame.add(passfield);

frame.setSize(300, 60);

frame.setVisible(true);