Question about JTextField and text format with numbers?

Question

I writing an application using Swing. My application has a text box and what I want to do is this: when user enters a number in that text field, if the number is in the thousands, then it is automatically appended a comma in the number. For example, if user enters 1000, then it should be automatically changed to 1,000, or 1,000,000 or so.

Does anyone give me some ideas, please?

do something in the event listener? which part do you think is difficult? — James.Xu, Mar 31 '11 at 10:02

score 4 · Answer 1 · answered Mar 31 '11 at 10:03

4

Try formattedTextFields

Also one more example. May be helpful to you.

answered Mar 31 '11 at 10:03

Harry Joy

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Mudassir · Accepted Answer · 2011-03-31T11:11:14.963

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You can use the DecimalFormat and NumberFormat classes. See an example here; http://www.exampledepot.com/egs/java.text/FormatNum.html

Update:

Example:

NumberFormat numberFormatter = new DecimalFormat("#,###,###");
String formattedNumber = numberFormatter.format(10000000);

JTextField numberTextField = new JTextField();

numberTextField.setText(formattedNumber);

edited Mar 31 '11 at 11:11

answered Mar 31 '11 at 10:05

Mudassir

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@Mudassir: @SamG: Can we show numbers in textFields this way? It just format numbers. isn't it? – Harry Joy Mar 31 '11 at 10:16
@mudassir, a Formatted Text Field is a more appropriate answer for handling this in a GUI. – jzd Mar 31 '11 at 11:08
@Harry Joy: Yes we can show numbers in TextFields this way. See the updated answer. – Mudassir Mar 31 '11 at 11:10
@Mudassor: OP wants to format the number while the user typing in textField. Not like this. I know this way of doing. But this is not OP is asking as per I understand his question. But OP has accepted your answer so enjoy rep points. ;-) – Harry Joy Mar 31 '11 at 11:13
@Harry: I was unaware of FormattedTextFields thats why I suggested it, your way is of course best suited. – Mudassir Mar 31 '11 at 11:16
@Mudassir: Wish OP thinks the same. :-) – Harry Joy Mar 31 '11 at 11:23
@Harry: Sorry Harry, I can't uncheck that green mark. :-( But of course I can give you a +1. – Mudassir Mar 31 '11 at 11:27

score 2 · Answer 3 · answered Mar 31 '11 at 10:04

2

Have a look at group seperators in DecimalFormat .

answered Mar 31 '11 at 10:04

SamG

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Question about JTextField and text format with numbers?

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