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Mark John
Courses Plus Student 771 Pointsjava challenge question.i need help with this question
this is the question==>So I was wondering if you could help me with some of these code challenges. As you might've seen when a member field name doesn't match the style we've talked about, I send an error about it. Let's write some code to validate the style of the field name.
I've added the method validatedFieldName it will return the validated field name. If the value passed in doesn't meet the requirements, throw an IllegalArgumentException. I'll keep you posted on the results every time you press check work....plz i need your suggestion
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' || fieldName.charAt(1) = !fieldName.isUpperCase() )
{
throw new IllegalArgumentException (" not acceptable");
}
return fieldName;
}
}
3 Answers
Steve Hunter
57,712 PointsHi Mark,
You have two things to test; the first character is a lowercase 'm' and the second character is capitalised. So, IF those two things are true, return the fieldName ELSE throw the exception.
My code came out something like this:
public static String validatedFieldName(String fieldName) {
if(fieldName.charAt(0) == 'm' && Character.isUpperCase(fieldName.charAt(1))) {
// both things are true - do whatever success looks like
return fieldName;
} else {
throw new IllegalArgumentException("This does not meet the requirements!");
}
// you could put the return line here
}
Although there are other ways of structuring this. The return statement can be outside of the if statement. If the true part is called, where the return is now, that means the else won't run. The tests are binary & mutually exclusive. So, the return can be after the if statement. You could negate both tests and have no else clause, perhaps! There are different solutions to this.
In your code, you are trying to assign values by using single-equals signs.
I hope that helps.
Steve.
Mark John
Courses Plus Student 771 PointsTanx
Steve Hunter
57,712 PointsDid that make sense to you and get you through the challenge?
Steve.
Mark John
Courses Plus Student 771 Pointstanx! am tru with the challenge