多维数组
多维数组：数组的元素，还是数组，数组套数组，就是多维数组
构造指定行与列的二维数组：Array.ofDim方法
val multiDimArr1 = Array.ofDim[Double](3, 4)
multiDimArr1(0)(0) = 1.0
构造不规则多维数组
val multiDimArr2 = new Array[Array[Int]](3)
multiDimArr2(0) = new Array[Int] (1)
multiDimArr2(1) = new Array[Int] (2)
multiDimArr2(2) = new Array[Int] (3)
multiDimArr2(1)(1) = 1
Java数组与Scala数组缓冲的隐式转换
Scala代码中，直接调用JDK（Java）的API，比如调用一个Java类的方法，势必可能会传入Java类型的list；Scala中构造出来的list，其实是ArrayBuffer；你直接把Scala的ArrayBuffer传入Java接收ArrayList的方法，肯定不行。
Scala数组转Java数组
import scala.collection.JavaConversions.bufferAsJavaList
import scala.collection.mutable.ArrayBuffer
val command = ArrayBuffer("javac", "C:\\Users\\Administrator\\Desktop\\HelloWorld.java")
val processBuilder = new ProcessBuilder(command)
val process = processBuilder.start()
val res = process.waitFor()
Java数组转Scala数组
import scala.collection.JavaConversions.asScalaBuffer
import scala.collection.mutable.Buffer
val cmd: Buffer[String] = processBuilder.command()
