Ok,still learning Arrays. I wrote this code which fills the array named "rand" with random numbers between 0 and 1( exclusive). I want to start learning Complexity. the For loop executes n times (100 times) ,every time it takes O(1) time,so the worse case scenario is O(n),am I right? Also,I used ArrayList to store the 100 elements and I imported "Collections" and used Collections.sort() method to sort the elements.

import java.util.Arrays;
    public class random
    {
        public static void main(String args[])
        {
            double[] rand=new double[10];

                    for(int i=0;i<rand.length;i++)
                    {
                        rand[i]=(double) Math.random();
                        System.out.println(rand[i]);
                    }   

                    Arrays.sort(rand);
                    System.out.println(Arrays.toString(rand));
        }
    }

ArrayList:

import java.util.ArrayList;
import java.util.Collections;

public class random
{
    public static void main(String args[])
    {
        ArrayList<Double> MyArrayList=new ArrayList<Double>();


        for(int i=0;i<100;i++)
        {               
            MyArrayList.add(Math.random());
        }

        Collections.sort(MyArrayList);


        for(int j=0;j<MyArrayList.size();j++)
        {
            System.out.println(MyArrayList.get(j));
        }

    }
}