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Reading text files

Reading text files

To read a text file, create a scala.io.Source object like this:

val f = scala.io.Source.fromFile(fname)

Or, if you think the class name is too long, import the class first:

import scala.io.Source
val f = Source.fromFile(fname)

The most important method of the Source object f is getLines, which allows you to iterate over all the lines of the file:

val fname = args(0)
val f = scala.io.Source.fromFile(fname)
for (line <- f.getLines())
  printf("%4d %s\n", line.length, line)
f.close()

The lines returned in the line variable contain no new-line characters anymore.

You should call f.close() when you are done with the Source.