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Java Java Objects Delivering the MVP Validating and Normalizing User Input

Thiago Silva
Thiago Silva
715 Points
Posted by Thiago Silva
Thiago Silva
715 Points

The code mentioned in this video did not compile because it is not possible to execute this.answer = answer.toLowerCase.

This happens because answer is declared as a String and not char, which makes sense for me. The case is, why did it compile for Craig if the code is the same? I have double-checked it. The variable answer cannot be changed to char because the would break the previous logic of the code.

1 Answer

andren
andren
28,558 Points
andren
andren
28,558 Points

It compiled because there is nothing wrong with it.

While you are right that a char cannot be stored in a String variable nothing in the code you quote deals with chars. toLowerCase is a method that exists on String objects and returns a lower case String. Since answer (the field variable) and answer (the parameter) are both strings the line of code you highlighted is not incorrect at all.

There is a toLowerCase method that can be used on chars "Character.toLowerCase()" but that is not the method used in the project.

If you are getting error messages about converting between char and String then you have probably declared one of the variables wrongly, or mistyped some of the code in the project.