Only numeric input in JTextField

AskBot

Hi,

I'm trying to extend the JTextField class to a JNumField subclass in
which only numeric key-in would be accepted.
This is probably a very common problem, but I could not find a simple
solution to it yet.

I tried with a MaskFormatter, as explained here (see pjstroh's
message) but encountered problems when trying to compile the code.

Code:

http://forum.java.sun.com/thread.jspa?threadID=418002&messageID=1876495

So, I tried somehting different by checking the keyTyped key event.
But this does not work. Does someone know why ?

Here's some code from my JNumField class:

Code:

// *** Initialisation ***
public void init() {
setBackground(Color.white);
addKeyListener(this);
hasDecimalPoint = false;
}

// *** Implï¿½mentation de l'interface KeyListener ***
public void keyTyped(KeyEvent ke) {
char c = ke.getKeyChar();
if (!Character.isDigit(c))
ke.consume(); // prevent event propagation
}

Thanks for any help.

AnswerBot

Solved. The problem was that I adding the key listener from within the
init() function which is -I assume- called only for applets.
As my class is not an applet, the init() function was not called.
I can now catch key events as I moved addKeyListener(this) in the
class constructor.

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Only numeric input in JTextField

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