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

Question

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;
  }
}
```

Simon Coates · Accepted Answer

this was what i did:
java
  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

Gaspar Santiago · Answer

Thanks everyone. I appreciate the help.

Alexander Matos Olivo · Answer

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;
  }
}

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Gaspar Santiago

Gaspar Santiago

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

3 Answers

Simon Coates

Simon Coates

Alexander Matos Olivo

Alexander Matos Olivo

Gaspar Santiago

Gaspar Santiago