assuming you want to print a '\' character, you have to know that it has special meaning inside parens. usually it means "hey, treat the next character as something special" - as in the case of "\n" means "treat the 'n' as a 'newline' character". This is commonly referred to an "escaped n". the backslash is referred to as the escape character.
so how to you print the escape character? you ESCAPE IT!!!
System.out.println("this will print a single backslash: \\)";
if you want a single frontslash, you can just print it:
System.out.println("this will print a single frontslash: /");
There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors