寒假学习笔记15

　　今天完成了spark实验四的编程。起初是在eclipse上安装了Scala的环境，同通过环境进行的相关内容的编程，Scala的编程和Java编程的思路差不多，在编程时的相关语句以及用法不太一样所以耗费了一些时间。程序代码。

源代码：

import scala.io.Source
import java.io.PrintWriter
import java.io.File
import Array._
import scala.util.control._

object exercise4_2 {
   def main(args: Array[String]){
    File() 
    
  }
   def File(){
     val AFile=InFile("A.txt")
     val BFile=InFile("B.txt")
     var CFile=concat( AFile, BFile)
     var CFile2=new Array[String](CFile.size)
     val loop = new Breaks;
     
     
     for(i<-CFile){
      loop.breakable{
       for(j<- 0 to CFile2.size-1 ){
         if(CFile2(j)!=null){if(i==CFile2(j))loop.break;}
         else {CFile2(j)=i;loop.break;}
       }
     }
     }
      outFile(CFile2)
   }
   def InFile(path:String) : Array[String] ={
    val source = Source.fromFile(path, "UTF-8")
    val lines = source.getLines().toArray
    return lines
     
   }
   def outFile(data:Array[String]){
    val writer = new PrintWriter(new File("C.txt"))
    for(i <-data)
    if(i!=null)writer.println(i)
    writer.close()
   }
}
求平均值

import scala.io.Source
import java.io.PrintWriter
import java.io.File
import Array._
import scala.util.control._

object exercise4_3 {
  def main(args: Array[String]){
    File() 
    
  }
  def File(){
    val data=InFile("student.txt")
    var student= ofDim[String](4,2)
    val loop = new Breaks;
    var time:Int=0
    for(i<-data){
      var text=String.valueOf(i);
      var text2=text.split(" ")
      loop.breakable{
      for(j<- 0 to student.size-1){
        if(student(j)(0)==null){student(j)(0)=text2(0);student(j)(1)=text2(1);loop.break;}
        else{
          if(text2(0)==student(j)(0)){student(j)(1)=String.valueOf(student(j)(1).toInt+text2(1).toInt);time+=1}
        }
      }}
    }
    for(j<-0 to 3){
     student(j)(1)=String.valueOf(student(j)(1).toDouble/3)
    }
    outFile(student)
  }
  def InFile(path:String) : Array[String] ={
    val source = Source.fromFile(path, "UTF-8")
    val lines = source.getLines().toArray
    return lines
     
   }
   def outFile(data:Array[Array[String]]){
    val writer = new PrintWriter(new File("avg.txt"))
    for(i <-0 to data.size-1)
    writer.println(data(i)(0)+" "+data(i)(1))
    writer.close()
   }
}