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Start your free trialKym Bryan Carasig
Courses Plus Student 1,013 PointsExpected "m_first_name" to fail but passed, but i already checked if the char is letter or not. still gives me the error
As the title says guys, i need some help and explanation if you got time. I'm having a hard time since i stopped programming for more than 1 year after graduating. Shame on me.
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'){
throw new IllegalArgumentException("All members fieldname must start with lower case letter m.");
}
if(Character.isLowerCase(fieldName.charAt(1)) || Character.isLetter(fieldName.charAt(1))){
throw new IllegalArgumentException("Second letter in fieldname should be a letter and should be camel-cased.");
}
return fieldName;
}
}
2 Answers
Kym Bryan Carasig
Courses Plus Student 1,013 PointsNVM guys. got it! i just forgot the ! sign XD
if(Character.isLowerCase(fieldName.charAt(1)) || !Character.isLetter(fieldName.charAt(1))){
throw new IllegalArgumentException("Second letter in fieldname should be a letter and should be camel-cased.");
}
instead of Character.isLetter(fieldName.charAt(1)) should be !Character.isLetter(fieldName.charAt(1))
Steve Hunter
57,712 PointsHi there,
I think the solution can be tidied up a little - there are only two tests (first letter is 'm' and second character is upper case) needed and they both must pass:
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
} else {
throw new IllegalArgumentException("This does not meet the requirements!");
}
return fieldName;
}
I hope that makes sense.
Steve.