How to solve a problem in java?

Question

Java

The task itself -> Implement a method that returns the letter in the UNICODE table after the "\" character (backslash) at distance a. <-
I can not understand how to solve it?
What do we have to do?
Help!
A small example, or template, or whatever you want to call it -> return (int) '\\' + (char) 1021;
But I do not understand how it works, and why if you use it, an error occurs!
Tell me why if you use it, you always get an error? is it because of the plus sign?
And at least chu-slightly tell how this works, please.

Answer 1

char simbolA = 'A';
char simbolB = (char)((int)simbolA+1);

Do you think the meaning is clear?

Answer 2

return (char) ('\\' + a);