Scala多维数组、Java数组与Scala数组的隐式转换

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

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。

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()

import scala.collection.JavaConversions.asScalaBuffer

import scala.collection.mutable.Buffer

val cmd: Buffer[String] = processBuilder.command()