program that calculates the average of 2 random numbers looping it 1000 times and saving to an array list

Mainclass

package loop;

        import java.util.ArrayList;

public class Mainclass {

    public static void main(String[] args)

    {

        ArrayList<Integer> Random = new ArrayList<Integer>();

        int upperBound = 1000;

        int lowerBound = 1;

        for(int i=0; i<upperBound; i++){

            int randomNumber = (int)(Math.random() * ((upperBound - lowerBound) + 1) + lowerBound);

            int randomNumber2 = (int)(Math.random()* ((upperBound - lowerBound) + 1)+ lowerBound);

            int x = (randomNumber + randomNumber2)/2;

            Random.add(x);

            System.out.println(x);

        }

    }

}