java - How can I real time check for exceptions after JTextField has been entered -

java - How can I real time check for exceptions after JTextField has been entered -

say have input field take int when submit button pressed.

how can disable button should field check not int.

ignore add number button it's irrelevant.

you could utilize documentlistener :

document document = jtextfiled.getdocument(); document.adddocumentlistener(new documentlistener() { @override public void insertupdate(documentevent e) { check(); } @override public void removeupdate(documentevent e) { check(); } @override public void changedupdate(documentevent e) { check(); } private void check() { if (!isinteger(jtextfiled.gettext())) { jbutton.setenabled(false); } else { jbutton.setenabled(true); } } });

java exception