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Start your free trialRoman Zhyvitski
861 PointsWhat's wrong with the line with a comment?
Help.
public class TeacherAssistant {
public static String validatedFieldName(String fieldName) {
String mFieldName = fieldName;
if (mFieldName.charAt(0) != 'm') { //Whats's wrong with this line?
throw new IllegalArgumentException("Wrong first letter");
}
if (Character.toUpperCase(mFieldName.charAt(1)) != mFieldName.charAt(1)) {
throw new IllegalArgumentException("Wrong second letter");
}
// 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;
}
}
2 Answers
Romel Liwag
4,183 PointsTry this code and happy Coding :)
```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
Boolean memberField = fieldName.charAt(0) =='m';
if(!memberField || !Character.isLetter(fieldName.charAt(1)) ||
fieldName.charAt(1) != Character.toUpperCase(fieldName.charAt(1)) ){
throw new IllegalArgumentException ("Start with 'm' and use camel-casing");
}
return fieldName;
}
}
Jess Sanders
12,086 PointsThe commented line is perfectly fine. It's your second condition that needs fixing. Try this,
if (!Character.isUpperCase(mFieldName.charAt(1))){
throw new IllegalArgumentException("Wrong second letter");
}