The first parameter for replaceAll is a String, but not a literal string, it is a regular expression.
The problem is that "*" has special meaning as part of an expression. To use a regular expression to match a single asterisk, use "\\*". The regular expression you want is '\*'. To get that you have to double the first backslash since "\*" is invalid -- it is not a valid Java escape sequence like "\n" or "\t". But "\\" means put in a single backslash. So if you code