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Start your free trialestherlee
4,618 PointsProblem with challenge Task in Java Ovject
This is a exercise: 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
But it says "m_first_name" passed. How does this come?
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("Start with m");
}
else if (fieldName.charAt(1) != fieldName.toUpperCase().charAt(1) && !Character.isLetter(fieldName.charAt(1))) {
throw new IllegalArgumentException("Camel!");
}
else {
return fieldName;
}
}
}
1 Answer
Nico Julian
23,657 PointsHi there,
In your second condition, you could use the isUpperCase method to determine if it's camel cased. I think you're getting the error "m_first_name passed" because the condition:
(fieldName.charAt(1) != fieldName.toUpperCase().charAt(1) && !Character.isLetter(fieldName.charAt(1))),
is checking first to see if the second letter doesn't equal its uppercased version, and simultaneously is not a letter. The '_' isn't a letter, but it appears to pass the first part of the condition, allowing it to slip through.
public class TeacherAssistant {
public static String validatedFieldName(String fieldName) {
if (fieldName.charAt(0) != 'm') {
throw new IllegalArgumentException("Start with m");
}
else if (!Character.isUpperCase(fieldName.charAt(1)) {
throw new IllegalArgumentException("Camel!");
}
return fieldName;
}
}
estherlee
4,618 Pointsestherlee
4,618 PointsThanks! Your solution is so great!