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check if input is String?

4 replies on 1 page. Most recent reply: Jan 13, 2004 5:08 AM by morki

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morki

Posts: 4
Nickname: sheva7
Registered: Jan, 2004

check if input is String?

Posted: Jan 12, 2004 2:47 PM

Hi, I'm wondering how I can check an input for a String. It has to be a String! If someone types a number the catch statement must identify the input as an Integer, giving a warning!
The other way around is ...catch (NumberFormatException e) {...}

thx!!

mausam

Posts: 243
Nickname: mausam
Registered: Sep, 2003

Re: check if input is String?

Posted: Jan 12, 2004 7:50 PM

I am not sure what u want...but checking instanceof may help.

Also for number u can compare char value shuldnt be b/w 0-9 ...
there can me many ways

morki

Posts: 4
Nickname: sheva7
Registered: Jan, 2004

Re: check if input is String?

Posted: Jan 13, 2004 1:05 AM

I mean:
if you have a textfield where one MUST enter only characters. If user then inputs numbers, program must catch this and give a warning like "only characters..."

mausam

Posts: 243
Nickname: mausam
Registered: Sep, 2003

Re: check if input is String?

Posted: Jan 13, 2004 1:08 AM

U can add either KeyListener to the text field or the documentListener to the textField and on keyPressed/keyTyped event can check if char typed is between 0-9 stop him

morki

Posts: 4
Nickname: sheva7
Registered: Jan, 2004

Re: check if input is String?

Posted: Jan 13, 2004 5:08 AM

okay thx
I'll try to come up with some code..

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