Str.lastIndexOf(“\”) giving an error [duplicate]

Answer 1

\ is an escape character. If you are using "\", its like escaping " character. Java understands it as " \" (quote missing). Hence the error to close the quote appears.

To resolve it you need to escape the \ character.

String word = str.substring(str.lastIndexOf("\\"));

Answer 2

You need to use

String word = str.substring(str.lastIndexOf("\\"));

the \ character inside a string is escaping special characters (",',\ and so forth). So using a \ before them would make it literal, which means java treats what comes after it as if it's a regular character.

You can test to see what

System.out.println("\\"); 

would print. It would print \.

So:

System.out.println("\" "); //would print one like this: "
System.out.println("\' "); //would print one like this: '

and so on.