Searching the occurrence of \

I have a String that stores a path. When I print the path, it is like: D:\UnderTest\wavtester.wav. In this string I wanted to know the index of the last occurrence of \ character (the goal is to get the name of the file represented in the String), so开发者_JAVA技巧 I tried to use the method:

int x = nameOfAudioFile.lastIndexOf('\');

But I get an error corresponding to this statement saying : unclosed character literal

• What does this error mean?
• How can I solve this error?

The \ character has special functions in character and string constant, so you need to escape it in order to write it itself as a character literal: string.lastIndexOf('\\').

Acatually, in order to be portable you probably want to use File.separatorChar instead of an explicit character constant. That way you'll get / on unix instead of \.

import java.io.File;

class FileString {

    public static void main(String[] args) {
        String fileName = "D:\\UnderTest\\wavtester.wav";
        System.out.println(fileName);
        File f = new File(fileName);
        System.out.println("Name: \t" + f.getName());
        System.out.println("Path: \t" + f.getParent());
        System.out.println("Exist: \t" + f.exists());
    }
}

Output

D:\UnderTest\wavtester.wav
Name:   wavtester.wav
Path:   D:\UnderTest
Exist:  false
Press any key to continue . . .

Disclaimer

This is not an answer to your question, it is not even an answer to the question, but merely the best suggestion I can provide in lieu of knowing what the actual question is. ;)

You need to add another \. You're escaping the ' with the single \, so it you should look like; nameOfAudioFile.lastIndexOf('\\')