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Looking for a "secure" JTextField.

Chris Kimball
Ranch Hand

Joined: Apr 23, 2012
Posts: 32

JTextField outputs only String objects, which are immutable. I'm looking for a look-alike class that allows a char[] output for security, just as JPasswordField does for single lines of text.

I can convert to and from Strings, but I don't want the text to exist as a String anywhere, for security purposes.

Thanks,

Chris
Michael Dunn
Ranch Hand

Joined: Jun 09, 2003
Posts: 4632
JPasswordField uses document.getText(), which returns a String.

I'd say you'd have to roll-your-own textfield for what you want.

one way might be to create a JTextField that is limited to 1 character,
it has no borders/margins etc, so it's just a little white square. you add
say 15 of these to a GridLayout panel, then you set the panel's border
to that of a normal textfield, so it should look like one textfield.

focuslisteners needed to check
1) if prior textfield empty, move the focus there
2) if textfield already has 1 character, move focus to next textfield

hard part will be handling e.g password is java, and you type jva,
you can place the caret between jv and add a.
Ranganathan Kaliyur Mannar
Bartender

Joined: Oct 16, 2003
Posts: 1083
    
  10

This seems to be a duplicate of your earlier post.
Many people answered and finally a simple suggestion was provided by Rob Spoor. Did you use it? Did you even read the replies to that post?


Ranga.
SCJP 1.4, OCMJEA/SCEA 5.0.
Jesper de Jong
Java Cowboy
Saloon Keeper

Joined: Aug 16, 2005
Posts: 14150
    
  18

Let's continue in your other post.


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subject: Looking for a "secure" JTextField.