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Java Java Objects (Retired) Delivering the MVP Validation

Benjamin Ing
Benjamin Ing
910 Points
Posted by Benjamin Ing
Benjamin Ing
910 Points

Stuck :(

I'm not sure how to check for upper case validation

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' && fieldName.charAt(1)   )
    {
      throw new IllegalArgumentException("member field names must start with an 'm'");
    }
    return fieldName;
  }

}

2 Answers

Michael Hess
Michael Hess
24,512 Points
Michael Hess
Michael Hess
24,512 Points

Hi Benjamin,

Try this:

public class TeacherAssistant {

  public static String validatedFieldName(String fieldName) {
   if (fieldName.startsWith("m") && Character.isUpperCase(fieldName.charAt(1))) {
      return fieldName;
    } else {
      throw new IllegalArgumentException("Invalid field name");
    }
  }
}

If you have any questions feel free to ask!

Mark VonGyer
Mark VonGyer
21,239 Points
Mark VonGyer
Mark VonGyer
21,239 Points

Google it.

I believe there is a method called isUpperCase(), which should return a boolean value of true for uppercased.