Question

I have a String str=p2\7\2010 I want to check and replace if str.contains("\") then replace it into this("\\\\") instead of \. i am unable to do this in Java please give your little effort.

Answer 1

use String.replace():

if (str.contains("\\")) {
    str = str.replace("\\", "\\\\");
}

You can also use String.replaceAll(), but it uses regular expressions and so is slower in such trivial case.

UPDATE:

Implementation of String.replace() is based on regular expressions as well, but compiled in Pattern.LITERAL mode.