How to replace " \ " with " \\ " in java

I tried to break the string into arrays and replace \ with \\ , but couldn't do i开发者_JAVA百科t, also I tried String.replaceAll something like this ("\","\\");.

I want to supply a path to JNI and it reads only in this way.

Don't use String.replaceAll in this case - that's specified in terms of regular expressions, which means you'd need even more escaping. This should be fine:

String escaped = original.replace("\\", "\\\\");

Note that the backslashes are doubled due to being in Java string literals - so the actual strings involved here are "single backslash" and "double backslash" - not double and quadruple.

replace works on simple strings - no regexes involved.

You could use replaceAll:

String escaped = original.replaceAll("\\\\", "\\\\\\\\");

I want to supply a path to JNI and it reads only in this way.

That's not right. You only need double backslashes in literal strings that you declare in a programming language. You never have to do this substitution at runtime. You need to rethink why you're doing this.

It can be quite an adventure to deal with the "\" since it is considered as an escape character in Java. You always need to "\" a "\" in a String. But the fun begins when you want to use a "\" in regex expression, because the "\" is an escape character in regex too. So for a single "\" you need to use "\\" in a regex expression.

here is the link where i found this information: https://www.rgagnon.com/javadetails/java-0476.html

I had to convert '\' to '\\'. I found somewhere that we can use:

filepathtext = filepathtext.replace("\\","\\\\"); 

and it works. Given below is the image of how I implemented it.

https://i.stack.imgur.com/LVjk6.png