Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community!

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

Java Java Objects (Retired) Delivering the MVP Validation


In this challenge, the task is to add illegalArgumentException if the displayed requirement are not met. how do I proceed?

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
    return fieldName;
  }public class static {boolean(validatedFieldName != mFieldname ||  mFieldName.mChar(1) != UPPERCASE_LETTER) throw (illegalArgumentException);

1 Answer

Jonathan Hector
Jonathan Hector
5,225 Points

You have to have a try and catch function like this

public static String...{ try{ if(condition) { block of code... } } catch (IllegalArgumentException iae){ System.out.printf("Sorry the error was\n %s \n", iae.getMessage()); } return fieldName; }

You'll notice that there are 2 \n so it makes your message clearer and cleaner.