Enthuware

The explanation contains the following:

2. Although the map part is not required because Item class overrides the toString method to print the name anyway, it is valid.

Actually it does not override toString so the map part is actually needed!

You are right. Fixed.
thank you for your feedback!
Paul.

One more thing, option one is not comparing for id attribute and is not syntactically correct: you're trying to compare a String and a primitive integer.
Id should be String too for this to work, or it should be an Integer to be able to use compareTo() method to compare two ids

Fixed.
thank you for your feedback!