`ArrayList` vs `Object[]` performance

Main.java

package main;

import java.util.ArrayList;
import java.util.List;

public class Main {
	private static final int RUNS = 10;
	static List<Integer> list;
	static int[] arr;

	public static void main(String[] args) throws Exception {
		notifier();
		final int count = Integer.MAX_VALUE / 100;
		write(count);
		read(count);
	}

	protected static void notifier() {
		new Object() {
			protected void finalize() throws Throwable {
				System.err.println("GC did run");
				notifier();
			};
		};
	}

	protected static void write(final int count) throws Exception {
		double listMs = measure(new Runnable() {
			@Override
			public void run() {
				list = new ArrayList<>(count + 1);
				for (int i = 0; i < count; i++)
					list.add(i);
			}
		});
		System.gc();
		Thread.sleep(1000);
		double arrMs = measure(new Runnable() {
			@Override
			public void run() {
				arr = new int[count];
				for (int i = 0; i < count; i++)
					arr[i] = i;
			}
		});
		System.out.println("list:" + listMs);
		System.out.println("arr: " + arrMs);
	}

	protected static void read(final int count) {
		double listMs = measure(new Runnable() {
			@Override
			public void run() {
				for (int i = 0; i < count; i++) {
					if (list.get(i) == -1) {
						System.out.println("err");
					}
				}
			}
		});
		double arrMs = measure(new Runnable() {
			@Override
			public void run() {
				for (int i = 0; i < count; i++)
					if (arr[i] == -1) {
						System.out.println("err");
					}
			}
		});
		System.out.println("list read:" + listMs);
		System.out.println("arr  read: " + arrMs);
	}

	public static double measure(Runnable run) {
		long[] times = new long[RUNS];
		for (int i = 0; i < times.length; i++) {
			System.out.print(".");
			long start = System.currentTimeMillis();
			run.run();
			long end = System.currentTimeMillis();
			times[i] = end - start;
		}
		System.out.println();
		int sum = 0;
		for (long l : times) {
			sum += l;
		}
		return (double) sum / times.length;
	}

}