Error while using the replaceAll() method

Question

I have some code that looks like this:

str.replaceAll('$', ' ');
return str;

What I'm trying to do here is replace every instance of $ in my string str with a space. But I get this error when I compile:

incompatible types: char cannot be converted to String
        str.replaceAll('$', ' ');
                       ^

But I'm not converting anything to string, I'm replacing a character by a space character. So why am I getting that error?

Answer 1

As per the javadocs the method you want to use is

public String replaceAll(String regex,
                String replacement)

so your code should look like

str.replaceAll ("$", "");  

note

If you really need to use replaceAll then escape the "$" mark \\$

BUT

As in regex "$" has a special meaning (end of the String) and you do not have any special regex requirements then use replace instead

str = str.replace ("$", "");  

Answer 2

replaceAll is expecting two strings, but you are passing chars. Use " instead of '