JTextField Constraints

[NycNessyness]

Hello everyone. I had a quick question. How can I go about setting constraitnts for a JTextField. I'm trying to not allow users to enter any non numeric numbers, except for dollar signs, commas and periods. Also how can I restrict a JTextField to only allowing two numbers to be entered. Like from 0-99. May someone give me an example to both please. Thanks in advance.

[jwenting]

set up a KeyListener to it which refuses to allow anything you don't want.

[NycNessyness]

set up a KeyListener to it which refuses to allow anything you don't want.

May I get an example of how I would do that please. I don't know how to set up constraints at all. I don't really need it for what I'm doing but it would save me some trouble from throwing exceptions, unless the user copy and pastes the info into the textfield.

[Ezzaral]

You can also use a JFormattedTextField: http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html
or an InputVerifier: http://java.sun.com/docs/books/tutorial/uiswing/misc/focus.html#inputVerification.

[NycNessyness]

You can also use a JFormattedTextField: http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html
or an InputVerifier: http://java.sun.com/docs/books/tutorial/uiswing/misc/focus.html#inputVerification.

Thanks alot!

[NycNessyness]

I tried some of the codes out and still couldn't find a solution. I'll give an example of what I'm trying to do. If I have a field named "JTextField num= new JTextField(10);", how can I make this particular field only accept number formats. It won't allow the user to input any letters at all before they even select enter.

[Ezzaral]

Those things are covered by the tutorials that I linked above.

[Ezzaral]

If you don't want to allow them to even type anything but numbers into field, you need to use the MaskFormatter: http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html#maskformatter
(Which you will see is covered in the first link I posted above on using JFormattedTextField)

[NycNessyness]

If you don't want to allow them to even type anything but numbers into field, you need to use the MaskFormatter: http://java.sun.com/docs/books/tutorial/uiswing/components/formattedtextfield.html#maskformatter
(Which you will see is covered in the first link I posted above on using JFormattedTextField)

I looked through it, worked perfectly. Thanks alot for the help!