Remove all occurrences of char from string

Try using the overload that takes CharSequence arguments (eg, String) rather than char:

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

Using

public String replaceAll(String regex, String replacement)

will work.

Usage would be str.replace("X", "");.

Executing

"Xlakjsdf Xxx".replaceAll("X", "");

returns:

lakjsdf xx