java char matching

trscookie · 10-18-2007, 12:31 PM

Hello all,

Im trying to write a class that will detect when I am pressing certain keys on the keyboard. I have done the easy part but now I am trying to write some thing so when i press any of the letter keys it will open a new text box so i pseudo code it would look like this:

Code:

if( char == [a-z][A-Z] )
{

     Action

}

ilikejam · 10-18-2007, 01:37 PM

Hi.

Sounds like you need a Pattern:
http://java.sun.com/j2se/1.5.0/docs/...x/Pattern.html

Dave

Alien_Hominid · 10-18-2007, 01:58 PM

You can use ASCII table (and check whether the char is > and < then specified values).

b0uncer · 10-18-2007, 02:08 PM

Quote:

Originally Posted by Alien_Hominid

You can use ASCII table (and check whether the char is > and < then specified values).

This, I think, is a fairly general method, but it has a weakness; ASCII table doesn't contain some characters that are used outside of English, so pressing those keys wouldn't work (it may cause funny things, because the number values for those keys are really different from those of ASCII chars). If the program never faces non-ASCII characters it's ok, but I wouldn't take chances..

jay73 · 10-18-2007, 02:49 PM

Maybe use a streamtokenizer? This can compare input (tokenizer.nextToken()) with a tokenizer. TT_WORD constant (word can be a single letter here) so you don't need to specify the range of letters yourself (although it is perfectly possible to do so in an if /else statement).

Alien_Hominid · 10-18-2007, 03:05 PM

Quote:

Originally Posted by b0uncer

This, I think, is a fairly general method, but it has a weakness; ASCII table doesn't contain some characters that are used outside of English, so pressing those keys wouldn't work (it may cause funny things, because the number values for those keys are really different from those of ASCII chars). If the program never faces non-ASCII characters it's ok, but I wouldn't take chances..

His pseudocode

Code:

if( char == [a-z][A-Z] )
{

     Action

}

didn't show that any special characters will be used.