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Mallikarjuna A S
Python Web Development Techdegree Student 7,017 PointsValidation Objective Test
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
// Convert String to Character of Array
char[] charArray = fieldName.toCharArray();
//Compare two Character where if value matches it return 0 or value charArray[0] is less than m then it returns -1 and charArray[0] is greater than m it returns 1
int firstField = Character.valueOf(charArray[0]).compareTo('m');
//First Letter Validation
if ( firstField != 0) {
throw new IllegalArgumentException("Invalid Argument");
}
//Second Letter Validation
if (Character.isLowerCase(charArray[1])){
throw new IllegalArgumentException("Invalid Argument");
}
return fieldName;
}
}
When I try to Check the Work to Pass the Code Challenge " I am getting Following Error "m_first_name has to failed but it is passed"
3 Answers
Mallikarjuna A S
Python Web Development Techdegree Student 7,017 PointsI have solved it
char[] charArray = fieldName.toCharArray();
//Compare two Character where if value matches it return 0 or value charArray[0] is less than m then it returns -1 and charArray[0] is greater than m it returns 1
char letter1 = charArray[0];
char letter2 = charArray[1];
//First Letter Validation
if ( firstField.indexOf(letter1) != 0) {
throw new IllegalArgumentException("Invalid Argument");
}
//Second Letter Validation
if (!Character.isUpperCase(letter2)){
throw new IllegalArgumentException("Invalid Argument");
}
return fieldName; }
Soumyadeep Mukhopadhyay
1,772 PointsYour code is perfect except a small mistake i.e., fieldName instead of firstField
char[] charArray = fieldName.toCharArray();
//Compare two Character where if value matches it return 0 or value charArray[0] is less than m then it returns -1 and charArray[0] is greater than m it returns 1
char letter1 = charArray[0];
char letter2 = charArray[1];
//First Letter Validation
if ( fieldName.indexOf(letter1) != 0) {
throw new IllegalArgumentException("Invalid Argument");
}
//Second Letter Validation
if (!Character.isUpperCase(letter2)){
throw new IllegalArgumentException("Invalid Argument");
}
return fieldName; }```
John Paige
7,436 Points 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
char[] charArray = fieldName.toCharArray();
char letter1 = charArray[1];
if (fieldName.charAt(0) != 'm' || !Character.isUpperCase(letter1)) {
throw new IllegalArgumentException("Invalid fieldName");
}
return fieldName;
}
}
The passing code I came up with. I did learn the "char[] charArray" syntax from this thread. Thank you, Mallikarjuna A S and Soumyadeep Mukhopadhyay for the contributions. The part I got stuck on was figuring out how to isolate the first character (after 'm') for an upper/lowercase comparison.
Soumyadeep Mukhopadhyay
1,772 PointsYou are welcome John Paige, hope you have solved your problem.