Scala IO case

import java.io.{
    BufferedWriter, FileWriter}
import scala.collection.mutable.ListBuffer
import scala.io.Source

object StuGrade {
    

  case class Student(var name: String,
                     var chinese: Int,
                     var math: Int,
                     var english: Int) {
    
    def getSum: Int = chinese + math + english
  }

  def main(args: Array[String]): Unit = {
    
    val source = Source.fromFile("./data/student.txt")
    val stuArr: Iterator[Array[String]] = source.getLines().map(_.split(" "))
    val stuList = ListBuffer[Student]()
    //  Traverse the acquired object , Encapsulate it as Student After the object , Add to List in 
    for (s <- stuArr) {
    
      stuList += Student(s(0), s(1).toInt, s(2).toInt, s(3).toInt)
    }
    //  Sort the list in descending order by total score 
    val sortList = stuList.sortBy(_.getSum).reverse.toList
    val bw = new BufferedWriter(new FileWriter("./data/stu.txt"))
    for (s <- sortList) {
    
      bw.write(s"${s.name}\t${s.chinese}\t${s.math}\t${s.english}\t${s.getSum}")
      bw.newLine()
    }
    bw.close()
    source.close()
  }

}