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Start your free trialJordan Man
2,736 Pointshow do i validate whether the user has followed the member fields naming rules
if the member fields name doesnt meet requirements, how to throw and illegal argument exception. to validate the input.
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.indexOf("m", 1)){
throw new IllegalArgumentException("This does not match the style we've talked about.");
}
return fieldName;
}
}
1 Answer
jcorum
71,830 PointsInstead of indexOf(), try charAt() for the first test. For the second, use the Character.isLetter() and Character.isUpperCase() functions:
public static String validatedFieldName(String fieldName) throws IllegalArgumentException {
// 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' ||
!Character.isLetter(fieldName.charAt(1)) || !Character.isUpperCase(fieldName.charAt(1))) {
throw new IllegalArgumentException();
} else {
return fieldName;
}
}
Happy coding!
Jordan Man
2,736 PointsJordan Man
2,736 PointsThank you very helpful :)