JPasswordField and KeyListener

Question

Can anyone help me with this code as I am a newbie in Java. I found this code on the web and I want to understand what it does?

pass = new JPasswordField(10);
    pass.addKeyListener(new KeyListener(){
            @Override
            public void keyTyped(KeyEvent e) {
                if(e.getKeyChar()==KeyEvent.VK_ENTER){
                    OKButton.doClick();
                }
            }

            @Override
            public void keyPressed(KeyEvent e) {
                //Do Nothing
            }

            @Override
            public void keyReleased(KeyEvent e) {
                //Do Nothing
            }

    });

As I understand it creates a text where everything I type is not visible, and I see bullets instead. Whats the purpose of the KeyListener? To identify the letters pressed?

Answer 1

This if(e.getKeyChar()==KeyEvent.VK_ENTER) checks whether the Key pressed is ENTER key or not.

If user pressed ENTER KEY the java code automatically presses OK Button.

For further understanding take a look at How to Write a Key Listener.

Answer 2

This code describes a field in which the user would put in a password. The point of the implementation of the KeyListener interface is to check if the user has pressed the Enter key on their keyboard. If the user does, the program clicks the OK button for him.

More on KeyListener: http://docs.oracle.com/javase/7/docs/api/java/awt/event/KeyListener.html