Scala Learning six: special characters in Scala

Scala Learning six: special characters in Scala special characters in Scala instructions for use:

Object Scalaoperator {def main (args:array[string]) {///::: Three colons: 2 collections merged println ("-------[:::]") Val list1 = List (1, 2) Val list2 = List (3, 4) Val listcombine = List1::: List2 Listcombin
        E.foreach (x = {println (x)}) println ("-------[::]")//:: 2 colon elements added to the collection element in front, set in after Val d = 5:: listcombine//= = Method Body indicator D.foreach (x = {println
        (x)})//-Construct a tuple of $ two println ("-------[->]") val one = 1 val dual = 2 Val C = one, println (c)///_n used to access data elements in tuples, coordinates starting from 1 println ("-------[_n]") pr Intln ("one =" + c._1) println ("one =" + c._1) println ("-------[<-]")//<-assigns the elements in the collection to Temporary variable for (v <-listcombine) {println ("v =" + V)} println ("-------arrBuf1 [Res
     ULT1] ")//   Val arrBuf1 = new Arraybuffer[int] () arrbuf1.+= (11)//Add an element arrbuf1.+= (33, 44)//Add multiple elements Arrbu F1.insert (1, 22)//in index=1, position insertion arrBuf1 + = 55//Add an element Arrbuf1.append (66)//Recover an element arrbuf1.pre Pend (77)//Append an element to the head arrbuf1.prepend (88)//Append an element to the head arrbuf1.prepend (99)//Append an element to the head for (elem <-arrBuf1) {println (Elem)} println ("-------arrBuf1 [Result2]") Arrbuf1.remove ( 3, 2)//start with index=3, delete 2 elements for (Elem <-arrBuf1) {println (Elem)} println ("------ 
        -ArrBuf1 [RESULT3] ") arrbuf1.trimend (2)//delete tail 2 elements for (Elem <-arrBuf1) {println (elem)
        } val arrBuf3 = arrbuf1.+:(3)//Add an element to the header and return a new collection println ("-------arrBuf3 [result] =")  Arrbuf3.foreach (x = {println (x)}) println ("-------arrBuf2 [result]")//Val
ARRBUF3 = 5 + + arrBuf2        Val arrBuf2 = new Arraybuffer[int] () arrbuf2.+= (3) arrbuf2.+= (4) arrbuf2.foreach (x =

        {println (x)})  println ("-------arrbufcom [result]")//ARRBUF2,ARRBUF1 All elements are added to the new collection arrbufcom, return arrbufcom Val arrbufcom = arrbuf1.++:(arrBuf2) arrbufcom.foreach (x = = {println (x)}) println ("-------ar
            RBUF1 [RESULT4] ")//Add all elements in ArrBuf2 to ARRBUF1 header arrbuf1.++=:(arrBuf2) Arrbuf1.foreach (x = { 
        println (x)})//: _* treats the set element as a sequence of arguments, println ("-------seq:_* [result]") in a function with a variable-length argument list
        Val seq = seq (1, 2, 3, 4, 5) println (my_sum (seq: _*))} def my_sum (args:int*): Int = { var result = 0 for (a <-args) {result + = a} return result}}