Hello,

   How can i validate users' input in a JText Field as integers?I am new to this, any help is appreciated.

 Thanks,

Sorry,

  Got it working.
   After trying many different things, this got it working:



public boolean simple_validate(String theStr){

   char strmyStr = theStr.tocharArray();

   for(int i=0; i < strmyStr.length; ++i){
       if(Character.isDigit[i]){
                 return true;
       }
                 return false;
    }
}

What do you gurus think? is this a good approach to solving the problem? or should i consider something else more compact?

 Thanks

This would return true if the second(you're pre-incrementing the loop index) character was a digit, even if the rest of the String contained non-digits.

If you're allowing longer (than 2 char) Strings it'd be better to do:

public boolean simple_validate(String theStr){
    char strmyStr = theStr.tocharArray();

    for(int i=0; i < strmyStr.length; i++){
       if(!Character.isDigit[i]){ // if character is NOT a digit, return false
             return false;
       }
    }
    return true; // if we get here, all the characters are digits
}

For very long Strings you might also want to look at using String.charAt(x), and save on the overhead of creating a character array:

public boolean simple_validate(String theStr){
    for(int i=0; i < theStr.length(); i++){
       if(!theStr.charAt(i).isDigit()) return false;
    }
    return true;
}


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correct code£º
public boolean simple_validate(String theStr)
    {

        char[] strmyStr = theStr.toCharArray();

        for (int i = 0; i < strmyStr.length; ++i)
        {
            if (!Character.isDigit(strmyStr[i]))
            {
                return false;
            }
        }
        return true;
    }

blackcow