Listing files with Java's File class

Code

GeSHi (java):
package Tutorial
 
object ControlStructures {
  def main(args : Array[String]) : Unit = {
    val location = "c:\\"
    val fileType = ".ini"
    val files = (new java.io.File(location)).listFiles
 
    // We can add in for expression if statements, filtering
    for (file <- files if file.getName.endsWith(fileType)) {
      println(file.getName)
    }
 
  }
}
 
Created by GeSHI 1.0.7.20

with more filtering..

Code

GeSHi (java):
object ControlStructures {
  def main(args : Array[String]) : Unit = {
    val location = "c:\\"
    val files = (new java.io.File(location)).listFiles
 
    // We can add in for expression if statements, filtering
    for (
      file <- files 
      if file.isFile; // need to add semicolons because it's meant as a one line
      if file.canRead;
      if file.getName.endsWith(".sqm")
    ) println(file.getName)
 
  }
}
 
 
Created by GeSHI 1.0.7.20

Searching in files, also this example uses nested looping

Code

GeSHi (java):
 
object ControlStructures {
  def main(args : Array[String]) : Unit = {
    val location = "c:\\"
    val fileType = ".txt"
    val files = (new java.io.File(location)).listFiles
 
    def fileLines(file: java.io.File) = 
      scala.io.Source.fromFile(file).getLines.toList
 
    def grep(pattern: String) =
      for (
        file <- files
        if file.getName.endsWith(fileType);
        line <- fileLines(file)
        if line.trim.matches(pattern)
      ) println(file.getName + "=> " + line.trim)
 
    grep(".*Java.*")
  }
}
 
 
Created by GeSHI 1.0.7.20