Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Victor Leschly Ørnby
Courses Plus Student 2,992 PointsFiguring out, checking uppercase on string without using isUpperCase char method
The header explains my problem
public class TeacherAssistant {
public static String validatedFieldName(String fieldName) {
if(!fieldName.startsWith("m")) {
throw new IllegalArgumentException("hej");
}
if() {
throw new IllegalArgumentException("Is uppercase");
}
// 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
return fieldName;
}
}
1 Answer
George Pirchalaishvili
3,747 PointsWell you can use something like this, but I do not understand why dont you just use isUppercase.
I would just make char Array out of string and than manipulate with them.
public class TeacherAssistant {
public static String validatedFieldName(String fieldName) {
if(fieldName.charAt(0) != 'm') {
throw new IllegalArgumentException("hej");
}
if(fieldName.charAt(1)=='_' || fieldName.toUpperCase().charAt(1) != fieldName.charAt(1)) {
throw new IllegalArgumentException("Is uppercase");
}
// 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
return fieldName;
}
}