Programming Scala 第6章 demo07

package base06import java.io._/**  * Created by dd on 2016/5/19 0019.  */object demo07 extends App{  def writeToFile(fileName: String)(codeBlock: PrintWriter => Unit)={    val writer = new PrintWriter(new File(fileName))    try{      codeBlock(writer)    }finally {      writer.close()    }  }  writeToFile("output.txt"){    writer=> writer.write("hello world")  }}