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Java Java Objects (Retired) Delivering the MVP Validation

Posted by micheala leaver
micheala leaver
1,313 Points

I've added the method validatedFieldName it will return the validated field name. If the value passed in doesn't meet th

I really don't know what I'm doing wrong so can someone please HELP !!

TeacherAssistant.java 
public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {
    // These things should be verified:
    // 1.  Member fields must start with an 'm'
       if (fieldName.charAt(0) != 'm' ) {
      throw new IllegalArgumentException ("error");
    }
    // 2.  The second letter in the field name must be uppercased to ensure camel-casing

       if (!Character.isUpperCase(fieldName.charAt(1))) {
         throw new IllegalArgumentException("Must be uppercase."); 
    // NOTE:  To check if something is not equal use the != symbol. eg: 3 != 4
    return fieldName;
    }

 }

1 Answer

jcorum
jcorum
71,830 Points

Close. But you need throws IllegalArgumentException in the method signature. And second, you need to see if the second char is a letter:

public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) throws IllegalArgumentException {
    // 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' || !Character.isLetter(fieldName.charAt(1)) || !Character.isUpperCase(fieldName.charAt(1))) {
      throw new IllegalArgumentException ("error");
    }
    return fieldName;
  }

}
micheala leaver
micheala leaver
1,313 Points

Thanks!!!