Villu was wrote this tiny SimpleResponse class in openscoring.common which is serializable and only one attribute, three methods, the getter, setter and the toString method, which is implemented using the MoreObjects.toStringHelper class.
First, we need to cover something basic about “toString“. It is a method that comes with class Object, basically means every class in Java is kind of a object and it should always inherit this default toString method unless overwritten. However, who need a hashcode, right?!. User tend to need something that is more informative and concise, like you might want the first name and last name out of a person object? a title, author in the textual format of a book class so on and so forth. You can overwrite toString in whatever way you prefer, but using the toStringHelper really made this part easy and consistent.
Keep this little trick in your toolbox and hopefully it is helpful sometime.