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Java Java Objects (Retired) Delivering the MVP Validation

Posted by Radu Stanciu
Radu Stanciu
Courses Plus Student 3,274 Points

What wrong with this code? how am i using the isuppercase method wrong?

how am i using the method wrong?

TeacherAssistant.java 
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

     if ( (fieldName.charAt(0)!='m') )
      throw new IllegalArgumentException ("nu e prima litera m");

     if ( (isUpperCase(fieldName.charAt(1))) )
      throw new IllegalArgumentException ("nu e prima litera m");

    return fieldName;
  }

}

2 Answers

landonferrier
landonferrier
25,097 Points

Radu, it appears to me that you are using two different if statements to complete the task. You can combine if statements with the either/or operator (||). also, it seems that you forgot to use the Character class when using the isUpperCase() method.

Here is the correct code:

TeacherAssistant.java 
public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {

   if (fieldName.charAt(0) != 'm' || !Character.isUpperCase(fieldName.charAt(1)) ) {
        throw new IllegalArgumentException(" Illegal field name. "); 
      }

   return fieldName;
  }
}

If you have any questions, feel free to ask!

Radu Stanciu
PLUS
Radu Stanciu
Courses Plus Student 3,274 Points
Radu Stanciu
Radu Stanciu
Courses Plus Student 3,274 Points

thanks.. i didn.t realize that i have to user Character.isUpperCase... considering the fact that i didn't have the Character class in my code.

But that is probably because Character class is a general class included in java so ... yeah... i get it.

Thanks a million!

landonferrier
landonferrier
25,097 Points

No problem Radu, I'm glad I could help!