5
I have a string that uses parts of another string, how to make this code more "clean"? Since it is very difficult to understand.
String sessionHash = dirPath.substring(dirPath.substring(0, dirPath.length() - 1).lastIndexOf("/"));
sessionHash: /23980dc32e16792007de3343f1f99211/
dirPath: /home/Daniela/oknok/data/uploads/23980dc32e16792007de3343f1f99211/
7
From what I understand I think the method getname() produces the result you expect:
String sessionHash = new File(dirPath).getName();
Or to look exactly the same:
String sessionHash = "/" + new File(dirPath).getName() + "/";
Behold working in the ideone. And in the repl it.. Also put on the Github for future reference.
4
You can do this through the method split: it breaks a string into pieces using a regular expression as the delimiter. Breaking around the bar, and grabbing the penultimate piece (the last one is empty as it is after the last bar) you get the result you want:
String[] partes = dirPath.split("/");
String sessionHash = "/" + partes[partes.length-2] + "/";
In the specific case of the bar, however, it is simpler to use the class File, just as suggested by Maniero.
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+1 and if she wants the bars around (such as in the example) just add them via string concatenation.
– mgibsonbr
@mgibsonbr changed to resolve this although I doubt that it is the intention to keep the bars. I was doing the same as you but I had an abortion because I didn’t think it would make me feel any better.
– Maniero
Apart from the
substringdouble, does not improve much even... You would know if this proposed method, using theFile, will give an equal result on a Windows system? (which uses "" instead of "/" as separator) I think will, but I’m without compiler here to test...– mgibsonbr
the intention was to keep the bars, thank you. Really much more readable and easy to maintain.
– Daniela Morais
@mgibsonbr as far as I know will work, but also can not guarantee.
– Maniero
If I’m not mistaken, there’s a constant in the class
File, toFileSeparator, which is best for this. Using the response value gets a little stuck to the OS for code execution.– mutlei
@mutlei I agree but in this case will not generate a file name but a string that the author only where will use. From what I understood need to be so even independent from OS, therefore in this specific case should not be used the
separator. Unless she says it has to be different.– Maniero