資料示例：

實現需求：先按第一列排序，若第一列相同按照第二列排序，依次類推

scals實現：

class SeveralSortKey(val arr:Array[String]) extends Ordered[SeveralSortKey] with Serializable{
  //重寫Ordered類的compare方法
override def compare(that: SeveralSortKey): Int = {
    val loop = new Breaks
    var 
 
result:Int = -1
loop.breakable {
      for (i <- 0 until arr.length) {
        if (this.arr(i).toInt - that.arr(i).toInt != 0) {
          result = this.arr(i).toInt - that.arr(i).toInt
          loop.break()
        }else{
          result = this.arr(i+1).toInt - that.arr(i+1).toInt
        }
      }
    }
    result
  }
}

object SortDemo{
  def main(args:Array[String]): Unit ={
    val conf = new SparkConf().setAppName("soft").setMaster("local")
    val sc = new SparkContext(conf)
    val lines = sc.textFile("f://sort.txt")
    val pairs = lines.map(line =>(
      new SeveralSortKey(line.split(" ")),line
    ))

    val 
 
softPairs = pairs.sortByKey()
    var softedLines=softPairs.map(line=>line._2)
    softedLines.foreach(println)
  }
}

注：當出現兩個一模一樣的行時，會報錯