I think I found an error in the question, which is the following one:
The underlined part should be "[LPaper;@<hashcode>". You even wrote that in the correct answer.Thus, in this question, the first println statement will print [LPaper@<hashcode> and the second println will print Paper@<hashcode>, both followed by a new line, of course.
Frankly, I unsterstand, why you wrote it ( because the explanation ), but if you say, that "[LPaper@<hashcode>" is printed out, it is simply false.
It is a little error, but it is one.
I hope that you correct it,
Kamil