loan pattern sample2

Loanp.scala

package com.github.takuya71

import java.io._

object Loanp {
  def main(args: Array[String]) {
    writeFile(new File("test.txt")){writer => 
    {
      //write start
      writer.println("line:1")
      writer.println("line:2")
      //write end
    }
    }
  }

  def writeFile[T](file: File)( write: PrintWriter => T):T = {
    //open file
    val writer = new PrintWriter(file)
    try {
      write(writer)
    } finally {
      //close file
      writer.close();
    }
  }
}