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

public class MillionNull {
    private static final int ONE_MILLION = 1_000_000;

    public static void main(String[] args) {
        final ArrayList<Object> myArrayListVariable = getObjects();

        System.out.println(myArrayListVariable.indexOf(null));
    }

    private static ArrayList<Object> getObjects() {
        final ArrayList<Object> myArrayListVariable = new ArrayList<>(ONE_MILLION);
        final Random random = new Random();
        for (int idx = 0; idx < ONE_MILLION; ++idx) {
            myArrayListVariable.add(random.nextInt());
        }
        myArrayListVariable.set(ONE_MILLION / 2, null);
        return myArrayListVariable;
    }
}