How to write list elements to a file in scala?

Question

I have a list l2 and I want to write the list elements to the file. I'm doing this:

val fw = new FileWriter("src/results.txt", true) ;
for( k <- 1 to l2.length) {
     println(l2(i))
     fw.write(l2(i))
     i+=1
 }
fw.close()

But, it does not write anything. Why is that ?

Yes, it's not empty. That's why I did println above fw.write, it's printing everything correctly. It is a list like this List(1,2,3) — Linda Su
– Linda Su, Commented Dec 4, 2014 at 9:07

ymonad · Accepted Answer · 2014-12-04 09:12:08Z

5

If l2 is List(1,2,3), you are calling .write(int c) of Writer class.

That means 01 02 03 in hex binary is written to file. You can confirm it with hexdump -C src/results.txt

To call .write(String str), try fw.write(l2(i).toString).

answered Dec 4, 2014 at 9:12

ymonad

12.1k1 gold badge41 silver badges50 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

almendar · Accepted Answer · 2014-12-04 11:50:47Z

1

To avoid for-loop you can do it like this:

import java.nio.file.Files;
import java.nio.file.Paths
val content = l2.mkString("\n").getBytes
Files.write(Paths.get("src/results.txt"), content)

answered Dec 4, 2014 at 11:50

almendar

1,81313 silver badges23 bronze badges