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Java Java Objects (Retired) Delivering the MVP Validation

Gaspar Santiago
Gaspar Santiago
3,377 Points

How do I validate whether or not the char at index 1 for the String parameter of the method is or is not capitalized?

I don't see how the lesson matches the preceding exercise.

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("Member field must start with a lower case m");
    }
    char secondLetter = fieldName.charAt(1);
    if(secondLetter.)
    {
      throw new IllegalArgumentException("Second letter in the field must be upper cased");
    }    
    return fieldName;
  }
}

3 Answers

Simon Coates
Simon Coates
28,693 Points

this was what i did:

  public static String validatedFieldName(String fieldName) {
    if(fieldName.length() > 2) {
      char a = fieldName.charAt(0);
        char b = fieldName.charAt(1);
      if(a == 'm' && Character.isUpperCase(b)) return fieldName;
    } 
    throw new IllegalArgumentException("some message here");
  }

seemed to pass

Alexander Matos Olivo
Alexander Matos Olivo
3,085 Points

Completing your code with your request

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("Member field must start with a lower case m"); } char secondLetter = fieldName.charAt(1); if(!Character.isUpperCase(secondLetter)) { throw new IllegalArgumentException("Second letter in the field must be upper cased"); }
return fieldName; } }

Gaspar Santiago
Gaspar Santiago
3,377 Points

Thanks everyone. I appreciate the help.