file

import java.io._
object Test {
   def main(args: Array[String]) {
       val writer=new PrintWriter(new File("test.txt"))
       writer.write("hello world")
       writer.write("\n")
       writer.write("hello scala")
       
       writer.close()   
   
   }}
Test.main(Array())

import java.io._
defined object Test

import scala.io.Source
object Test {
   def main(args: Array[String]) {
      
       Source.fromFile("test.txt").foreach{
                print
}



}}
Test.main(Array())


hello world
hello scala
import scala.io.Source
defined object Test

import scala.io._
object Test {
   def main(args: Array[String]) {

        print("请输入菜鸟教程官网 : " )
        val line = StdIn.readLine()
        println("输入:"+line)


}}
Test.main(Array())



请输入菜鸟教程官网 : 输入:null
import scala.io._
defined object Test