CODEWITHSUNDEEP
path
user4754843
user4754843

Reputation:

FileNotFoundException with absolute path

I have a directory like this:

assigment
 |
 |__ src
 |   |
 |   |__ Main.scala
 |
 |
 |__ testcase
     |
     |__ Simple.in

In Main.scala, Simple.in is read by Source.fromFile():

val inputFile = "Simple.in"
val lines = Source.fromFile("./testcase/" + inputFile).getLines

But when I run Main.scala in sbt the FileNoutFoundException appear. When I change the path to "../testcase/" + inputFile then it works fine. The original path is from my teacher, so I wonder which path is actually correct? Oh, I'm using Linux btw...

Upvotes: 2

Views: 51

Answers (2)

Nagarjuna Pamu
Nagarjuna Pamu

Reputation: 14825

. => current dir

.. => one above curren dir

But standard way to access resources is using the resources folder of sbt project structure.

This way helps you to access files independent of where (which class) you are accessing the resource in the code.

Folder to put your files

src/main/resources

val stream : InputStream = getClass.getResourceAsStream("/readme.txt")
val lines = scala.io.Source.fromInputStream( stream ).getLines

Upvotes: 1

GhostCat
GhostCat

Reputation: 140427

./ means: the current path

../ means: the directory "above" the current directory

Thus: when you run your Scala class from "src", "./testcase" makes it look for a directory testcase within "src"; or using full path names:

"assignment/src/" + "./testcase" turns into "assignment/src/testcase"

Whereas, when you use

"assignment/src/" + "../testcase" turns into "assignment/testcase"

therefore, the version with ".." finds the valid path. That is all the magic here!

Upvotes: 1

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