"Scala" Scala Array (iii)

Basic content

1. Array definitions

Definition of fixed length, variable array, element addition, deletion, sorting, summation and other common operations

Import Scala.collection.mutable.ArrayBufferimport scala.math.bigdecimal.roundingmode/** * @author Xwolf * @date    2017-04-09 18:23 * @since 1.8 */object Collection {def main (arg:array[string]): Unit ={Multiplearray ()}/** * Array Creation */private def create (): unit={val a = new array[string] (1) A (0) = "Hello" println (A.tobuffer) Val A b =arraybuffer (3) ab+=1//append can accept multiple parameters, append elements at the end of the array ab.append (12,3,3) ab ++=array (5,12) println ("Insert Afte R 1: "+ AB" ab + = (3,5) println ("Insert after 2:" + AB)//Add Element Ab.insert (2,123,32) println at the specified index ("Remove B Efore: "+ab"//Remove elements of the current index Ab.remove (1) println ("Remove after 1:" + AB)//Remove the number of elements starting at the current index, exceeding the exception that would throw an subscript out of bounds ab.remove ( 4,3) println (ab) val ary = Ab.toarray val arrayb = Ary.tobuffer println (ARRAYB)}/** * Sort */def SOR    T () {val ary =arraybuffer[int] () ary ++=array (1,123,3,123,4,12,10) println (ary) val a = Ary.sortby (x=>x) println (a)//custom sort Val c= Ary.sortwith ((b) =>a.compareto (b) <0) println (c) Val d= Ary.sortwith ((b) =>a.compareto (b) >0) Val F = Ary.sorted println (f) println (d)//de-re-filter map val e = d.distinct.filter (_.% (    2)!=0). Map (_.+ (2)) println (e)}/** * Common operations */DEF calculator (): unit={val ary =array (12,2,12,33,2,123,1)  println (Ary.max)//maximum println (ary.min)//Minimum println (ary.sum)//Sum println (average (ary))//averaging}/** * averaging of the array    Rounding retains two decimal places * @param ary * @return * * Private def average (Ary:array[int]): bigdecimal={val len = ary.length    Val sum = ary.sum (bigdecimal.valueof (SUM)./(Bigdecimal.valueof (len))). Setscale (2,roundingmode.up)}/** * Multidimensional array */def Multiplearray (): Unit ={//multidimensional array definition val mary = new Array[array[int] [2] Mary (0) =array (1,2,3,1,4) Mary (1) =array (2,1,4) for (ary<-mary) {println (Ary.tobuffer)}//Definition 2 row 3 column array val nary =array.ofdim[int] (2,3    ) nary (0) (0) =12 nary (0) (1) =13 nary (0) (2) =14Nary (1) (0) =22 nary (1) (1) =23 nary (1) (2) =24 println (Nary.tobuffer) for (i<-0 until Nary.length) {println ( Nary (i). tobuffer)}}}

　　

Implicit conversions are used in Scala array operations.

For more information, refer to:

Scala array

Scala-Implicit conversions

"Scala" Scala Array (iii)