Array:数组

val arr = Array(1,2,3,4,5)

val arr = new Array[int](10)

arr.mkString(" and ")                   //(1 and 2 and 3 ...)

arr.mkString("<", ",", ">")            //(<1,2,3,4,5>)

 

矩阵/二维数组： 

val matrix = Array.ofDim[Double](3,4)             //三行四列

matrix(2)(3) = 42

 

ArrayBuffer：可变数组，需要 import scala.collection.mutable.ArrayBuffer

val arrBuffer = ArrayBuffer[int]()

arrBuffer += 1

arrBuffer += (1,2,3)

arrBuffer ++= Array(3,4,5)

arrBuffer.trimEnd(5)

arrBuffer.insert(2,6,7,8,9)

arrBuffer.remove(2,3)                //从下标为2开始删除3个