Java JTextfields

Question

Just a quick question, How do i ensure my JtextField only accepts numeric values? I want it to to diplsy an error message if the user entered anything else thank you

See also http://stackoverflow.com/questions/1313390/is-there-any-way-to-accept-only-numeric-values-in-a-jtextfield/1313448#1313448 - no need for nasty error messasges. — Tom Hawtin - tackline, Dec 14 '10 at 17:26
Try this: http://stackoverflow.com/questions/1313390/is-there-any-way-to-accept-only-numeric-values-in-a-jtextfield — Igor, Dec 14 '10 at 17:17

score 6 · Answer 1 · answered Dec 14 '10 at 17:16

You can use a JFormattedTextField. Construct it using a NumberFormatter and it will only accept numbers.

The JFormattedTextField has a bunch of configurable options that let you decide how bad input is handled. I recommend looking at the documentation.

score 1 · Answer 2 · answered Dec 14 '10 at 17:18

1

You can either add a key event listener and check each char typed in or there are document formatters (NumberFormatter) you can install that will not allow you to enter anything but a number.

answered Dec 14 '10 at 17:18

Merky

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score 0 · Answer 3 · answered Dec 14 '10 at 17:24

0

Associate a key listener with the text field and check for the value just inserted. If value inserted is not an integer, then prompt error.

answered Dec 14 '10 at 17:24

Logan

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I like this idea but but how would i check for value entered? might you have an example code? thanks – Maxi90 Dec 14 '10 at 17:50

Pranjal Choladhara · Answer 4 · 2013-09-28T15:27:33.863

-1

I use this trick.

private void myTextFieldKeyReleased(java.awt.event.KeyEvent evt) {
try{
int i = Integer.parseInt(myTextField.getText());
}
catch(Exception ex){
//Show error message here with 
JOptionPane.showMessageDialog(null, "Invalid Input...!");
myTexTField.setText("");
}
}

edited Sep 28 '13 at 15:27

answered Sep 28 '13 at 14:26

Pranjal Choladhara

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keyListeners are too low-level for such a task, they are not safe enough: it'll miss pasted texted. – kleopatra Sep 28 '13 at 15:30

Java JTextfields

4 Answers4

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