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Steve Kinsey
4,463 PointsHaving problems checking for valid member variable names :-(
Been trying to get this working for ages and have tried a few different ways but still no joy.
I also think I might now be over-complicating the code.
Anyone know if I might be on the right lines with this?
Cheers Treehousers :-)
public class TeacherAssistant {
public static String validatedFieldName(String fieldName) {
// These things should be verified:
// 1. Member fields must start with an 'm'
// 2. The second letter in the field name must be uppercased to ensure camel-casing
// NOTE: To check if something is not equal use the != symbol. eg: 3 != 4
char firstLetter = fieldName.charAt(0);
if (firstLetter !='m') {
throw new IllegalArgumentException("Must start with 'm' please");
}
char secondLetter = fieldName.charAt(1);
boolean isSecondLetterCapital = Character.isUpperCase(char secondLetter);
if (!isSecondLetterCapital)
{
throw new IllegalArgumentException("2nd letter must be a capital please");
}
return fieldName;
}
}
3 Answers
mrben
8,068 PointsYou've pretty much got it!
The problem is on this line:
boolean isSecondLetterCapital = Character.isUpperCase(char secondLetter);
You're declaring a new char to pass into Character.isUpperCase (which is a syntax error) rather than using the one you created on the previous line.
Steve Kinsey
4,463 PointsSo something like...
char secondLetter = fieldName.charAt(1);
if(secondLetter != Character.isUpperCase(secondLetter) || !Character.isLetter(secondLetter)){
???
mrben
8,068 PointsJust drop the char in your call to isUpperCase in the code you posted originally and it should work.
Steve Kinsey
4,463 PointsDoh, of course, what a simple error to be melting my head for so long!!!
We got green though :-)
Thanks as ever for taking the time mrben, I really appreciate it...you just saved my head from java meltdown!!!
Peace