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Java Java Objects (Retired) Delivering the MVP Validation

Sean Kelly
Sean Kelly
843 Points
Posted by Sean Kelly
Sean Kelly
843 Points

TeacherAssistant exercise problem in Java Objects

"mFirstName should have passed, but "please make the second letter upper case!" was reported

Don't really understand where I have gone wrong!

TeacherAssistant.java 
public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {

     char firstLetter = fieldName.charAt(0);
    firstLetter = Character.toLowerCase(firstLetter);
    if(firstLetter != 'm') {
      throw new IllegalArgumentException("Please begin member fields with 'm' "); }



    char secondLetter = fieldName.charAt(1);
    if(secondLetter != Character.toUpperCase(secondLetter)); { 
     throw new IllegalArgumentException("Please make the second letter upper case!"); }


    // 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
  }

}

2 Answers

Dan Johnson
Dan Johnson
40,533 Points
Dan Johnson
Dan Johnson
40,533 Points

On the line with your second conditional, you have a semicolon terminating the if statement before it enters the block:

// Remove the semicolon
if(secondLetter != Character.toUpperCase(secondLetter));

So your second exception gets thrown regardless of the outcome.

Don't forget to return fieldName at the end.

Sean Kelly
Sean Kelly
843 Points
Sean Kelly
Sean Kelly
843 Points

Thanks, Dan. I fixed the error on the second conditional, but I'm now getting another error message, this time on the first conditional:

" Expected "m_first_name" to fail but it passed "

Jorge Paredes Cimadevilla
Jorge Paredes Cimadevilla
3,068 Points
Jorge Paredes Cimadevilla
Jorge Paredes Cimadevilla
3,068 Points

Hi Sean for the second question you asked, you need to add a third validation (they didn't mention this I know, quite frustrating when I found out).

You could do something like this in your case:

if (! Character.isLetter(secondLetter)) { throw new IllegalArgumentException("A letter is required"); }