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Comaparison between ParallelSort and Sort in JAVA

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import java.util.ArrayList;
import java.util.Arrays;
import java.util.Random;

public class sortvsparllelsort {
    public static void main(String[] args) {
        Random random=new Random();
        System.out.println("Comparison between Sort and Parallel Sort");
      ArrayList<Integer> arraylist=new ArrayList<>();
        for (long i=1;i<10000000L;i++)
        {arraylist.add(random.nextInt(900));

        }
        System.out.println("ArrayList has been initialised");
        Integer a[]=new Integer[arraylist.size()];
        Integer b[]=new Integer[arraylist.size()];
        System.out.println("Both normal arrays are initialised");
   a= arraylist.toArray(a);
   b=Arrays.copyOf(a,a.length);
        System.out.println("comparison starting ");
        double start,end,sorttime,parallelsorttime;
        System.out.print("Time taken by Sort method=");
        start=System.nanoTime();
        Arrays.sort(a);
        end=System.nanoTime();
        sorttime=(end-start)/(Math.pow(10,9));
        System.out.println( sorttime +" Seconds");
        System.out.print("Time taken by parallel sort =");
        start=System.nanoTime();
        Arrays.parallelSort(b);
        end=System.nanoTime();
        parallelsorttime=(end-start)/(Math.pow(10,9) );

        System.out.println(parallelsorttime +" Seconds");
      String verdict="";
      verdict=sorttime>parallelsorttime?"ParallelSort ":"Sort ";
      verdict+=" IS BETTER than ";
      verdict+=sorttime>parallelsorttime?"Sort ":"ParallelSort";
        System.out.println(verdict.trim());


    }
}

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