多维数据
什么是多维数组?: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 mutilDimArr1 = 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。
import scala.collection.JavaConversions.bufferAsJavaList import scala.collection.mutable.ArrayBuffer val command = ArrayBuffer("javac", "src\\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()
public class HelloWorld { public static void main(String[] args) { System.out.println("Hello World"); } }