java – String. Error in replaceall() function

I'm trying the following code: –

String x = "asdfg/dgws";
x.replaceAll("/","\\");

But it was a failure This gave me the following error message: –

Exception in thread "main" java.lang.Stringindexoutofboundsexception: String index out of range: 1
    at java.lang.String.charAt(UnkNown Source)
    at java.util.regex.Matcher.appendReplacement(UnkNown Source)
    at java.util.regex.Matcher.replaceAll(UnkNown Source)
    at java.lang.String.replaceAll(UnkNown Source)
    at com.jai.SecLargest.main(SecLargest.java:13)

I can't figure out why this anomaly happened?

Solution

String. Replaceall end use (or equivalent) matcher Replaceall, which contains the following:

Although you can avoid backslashes based on Alex R's answers, I strongly recommend that you use substitution:

String y = x.replace('/','\\');

More clearly, IMO – don't use replaceall unless you really try to express patterns through regular expressions

Also note that there is no operation when writing code; Strings are immutable in Java, so the replaceall method (and similar methods) returns a reference to a new string with modifications