Convert string question... "\"

I try the below code on jsp, but result is : a , a\b
but I want the result is : a\\b, a\\\\b
Thanks !
<%
     String str = "a\b, a\\b";
     String outStr = "";
     for (int i=0;i<str.length();i++){
          char c = str.charAt(i);
          if (c == '\\'){
               outStr += "\\";
          else{
               outStr += c;
%>
<%=outStr%>

Right, because the compiler interprets "\\" as an escape character, indicating that you want a backslash. (If you tried to just use a String "\", you'd probably get a compilation error, since the compiler would think you were trying to escape the second quotation).
I think you're going to need to use RegExp... this question has been asked a bunch before, so search through the forums for an answer.

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Convert string question... "\"

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