40th: Set, Map, TreeSet, treemap operation code Combat

code example:

Package com.dt.scala.datasetobject set_map {  def main (args: Array[String]) : unit = {    // set  the collection, the data in the collection is non-repeatable. But the data is unordered.     val dataset = set (1,2,5,4,1,3,2)     println (dataSet )         val dataset2 = dataset.+ (1)  //add elements to the collection, Generate another collection     val dataset3 = dataset.++ (DataSet2)  //  Two collection merge, return new collection         import scala.collection.mutable    //   Define variable collection     val data = mutable. set.empty[int]    data += 1 //adding elements to the collection          data ++=list (3,4)  //  add elements from the list to the collection          println (data)     //  ordered set treeset   &Nbsp;import scala.collection.immutable    val ts = immutable. TreeSet (1,3,2,5,2,3,9,7)     println (TS)  //treeset (1, 2, 3, 5, 7,  9)         //variable treeset    val mts =  mutable. Treeset[int] ()     mts.add (1)     //add a list to TreeSet      mts.++= (List (1,2,3,9,7,5))     println (MTS)              //TreeMap  mapping, sorting values by default     val tmap =  Immutable. TreeMap ("Spark"->10, "Hadoop"->5, "Yarn"->8)         println ( TMap)       }}

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40th: Set, Map, TreeSet, treemap operation code Combat