Validate numeric characters only Java

Question

I was wondering if there was a way to validate in my app so text entered into a "Phone Number" section can only add numeric characters and adds a System.out.println if the user attempts to enter Alphabetical/Special characters. I've uploaded my code here: http://pastebin.com/jZ7Xgiq9 Since I'm not too sure how I'd implament it.

I was also wondering if there was a way to disable spaces being added?

score 1 · Answer 1 · answered May 02 '13 at 07:56

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Check out Googles lib for parsing phonenumbers, it's really neat!

answered May 02 '13 at 07:56

jontejj

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score 0 · Answer 2 · answered May 02 '13 at 07:57

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You can user NumberUtils.isDigits from Apache

answered May 02 '13 at 07:57

Apurv

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Why to use Apache library???? (Not me who downvoted) – asifsid88 May 02 '13 at 08:05
@asifsid88 It will provide you with a well tested code that a regex may not be able to provide. – Apurv May 02 '13 at 08:07

score 0 · Answer 3 · answered May 02 '13 at 07:58

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Use regular expressions. [0-9]*

answered May 02 '13 at 07:58

Adam Stelmaszczyk

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score 0 · Answer 4 · answered May 02 '13 at 09:14

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Add a KeyListener to txtPhone and use, txtPhone.getText().matches("[0-9]*"); at keyTyped() event.

answered May 02 '13 at 09:14

Thudani Hettimulla

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Validate numeric characters only Java

4 Answers4