Re: Strings: how to check for non-numeric chars..

From:

Are Nybakk <news@arenybakk.com>

Newsgroups:

comp.lang.java.help

Date:

Sun, 11 Nov 2007 10:50:17 +0100

Message-ID:

<fZWdnVcg_bUVTava4p2dnAA@telenor.com>

maya wrote:

hi,

I can't figure out to check whether or not a string contains any
non-numeric characters (to 'pass' my filter it can only contain chars
from 1 to 9, that's it...

Here's a suggestion.

Boolean nonNum = false;
for(int i = 0; i < yourString.lenght && !nonNum; i++) {
    char c = yourString.charAt(i);
    if(!(c <= '9' && c >= '0')) {
       nonNum = true;
    }
}

I read in OReilly Learning Java (5.0), chapter 10, which deals with
Strings, did not find how to do this there...

came up with this formula:

String numChars[] = {"1","2","3","4","5","6","7","8","9"};
public boolean checkNonNum(String FileName) {
    for (int i=0; i < numChars.length; i++) {
        if (FileName.indexOf(numChars[i]) == -1) {
            return false;
        }
    }
    return false;
}

but it doesn't do what I want.. I don't know how to say if the string
contains ANY character that is NOT in the numChars[] array return false..

thank you very much..