Perform KS-test on Random Number Generator [closed]

I've just started practicing Functional Programming in Scala in some days. This is the code I used to perform KS-test on a random number generator.

class RNG {
    def next(): Double;
}

import scala.math.sqrt;
object main {
  val length: Int = 100000;
  def main(args: Array[String]) {
    // generate 100000 random numbers
    var seed: Array[Long] = Array.range(1, 7).map(x => x.toLong);
    var gen: RNG = new RNG(seed);
    var data: Array[Double] = (new Array[Double](length)).map {case (x) => gen.next()};

    // sort data
    val sorted = data.sortWith((x, y) => x < y);

    // perform ks test
    val baseline: Array[Int] = Array.range(0, length);
    val baselinemin: Array[Double] = baseline.map {case (x) => x.toDouble/length}
    val baselinemax: Array[Double] = baseline.map {case (x) => (1+x.toDouble)/length}

    val diffmin = (sorted.zip(baselinemin)).map {case (x, y) => x - y};
    val diffmax = (sorted.zip(baselinemax)).map {case (x, y) => y - x};

    val max1 = diffmin.max;
    val max2 = diffmax.max;

    val d = if (max1 > max2) max1 else max2;
    println("D\t" + d);
    val dbase = 2/sqrt(length);
    println("D base\t" + dbase);
  }
}

There is a little weird thing that in line

var data: Array[Double] = (new Array[Double](length)).map {case (x) => gen.next()};

Question:

• if I remove new, the program returns a wrong answer.
• Is there any way to make this code looks more professional?

Thanks!