Calculate and display the average every second

averageEverySecond.java

package bit.clockworks; // probably unused lol

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

public class Main implements Runnable {

    @Override
    public void run() {

        var changingValues = new ArrayList<Float>();

        for (;;) {
            var changingVar = getChangingVar();

            if ((
              changingValues.size() > 0 &&
                changingVar != changingValues.get(changingValues.size() - 1)
            ) ||
              changingValues.size() == 0) {

                changingValues.add((float) changingVar);
            }

            var visibleVar = changingValues.stream().mapToDouble(val -> val).average().orElse(0.0);
            System.out.println("visibleVar : " + visibleVar);

            try {
                Thread.sleep(4000);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }

    }

    public static void main(String[] args) {
        Thread t = new Thread(new Main());
        t.start();
    }

    public static int getRandomNumberUsingNextInt(int min, int max) {
        Random random = new Random();
        return random.nextInt(max - min) + min;
    }

    // should be getChangingVal since var is reference to mem addr
    public static int getChangingVar() {
        return getRandomNumberUsingNextInt(0, 1000);
    }
}