Scala file I / O

Scala for file write operations are java directly in the I / O type(java.io.File):

import java.io._

object Test {
   def main(args: Array[String]) {
      val writer = new PrintWriter(new File("test.txt" ))

      writer.write("本教程")
      writer.close()
   }
}

Execute the above code will produce a test.txt file in your current directory, file contents as the "Guide":

$ scalac Test.scala 
$ scala Test
$ cat test.txt 
本教程

Read user input from the screen

Sometimes we need to receive user input to the instruction screen handler. Examples are as follows:

object Test {
   def main(args: Array[String]) {
      print("请输入本教程官网 : " )
      val line = Console.readLine
      
      println("谢谢，你输入的是: " + line)
   }
}

Execute the above code will display the following message on the screen:

$ scalac Test.scala 
$ scala Test
请输入本教程官网 : www.w3big.com
谢谢，你输入的是: www.w3big.com

Read from the file

Read the contents from the file is very simple. We can use Scala'sSource and associated class object to read the file.The following example demonstrates the "test.txt" (previously have been created) reads the contents of the file:

import scala.io.Source

object Test {
   def main(args: Array[String]) {
      println("文件内容为:" )

      Source.fromFile("test.txt" ).foreach{ 
         print 
      }
   }
}

Implementation of the above code, the output is:

$ scalac Test.scala 
$ scala Test
文件内容为:
本教程