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caleb morton
Courses Plus Student 1,007 PointsWhy am I getting null?
I ran the logic through java-repl and it seems sound. Say String n = "name"; String n2 = "first"; n.indexOf('m'); n2.indexOf('m'); should be either -1 if it isn't in the string or above 0 if it is not the first character. Why am I getting null in my code?
public class TeacherAssistant {
public static String validatedFieldName(String fieldName) {
// These things should be verified:
// 1. Member fields must start with an 'm'
if (fieldName.indexOf('m') > 0 || fieldName.indexOf('m') < 0){
throw new IllegalArgumentException();
}
// 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
return fieldName;
}
}
1 Answer
Andrew Dummer
6,885 PointsInstead of " indexOf('m') > 0 " try " charAt(0) !='m' " which will look at the first character in the string and see if it is not equal to 'm'.