Java Performance Test

JavaPerf.java

package javaperf;

import java.util.*;

public class JavaPerf
{
    private static Map<Integer, UUID> uuidMap = new HashMap<>();
    private static List<UUID>         uuids   = new ArrayList<>();

    public static void main(String[] args)
    {
        for (int i = 0; i < 100000; i++)
        {
            UUID uuid = UUID.randomUUID();
            uuidMap.put(i, uuid);
            uuids.add(uuid);
        }

        Random random = new Random();

        int index = random.nextInt(uuids.size() - 1);

        // Map test
        long mapOne = System.currentTimeMillis();
        System.out.println(String.format("Value of index %d is: %s", index, uuidMap.get(index).toString()));
        long mapTest = System.currentTimeMillis() - mapOne;

        long listOne = System.currentTimeMillis();
        System.out.println(String.format("Value of index %d is: %s", index, uuids.get(index).toString()));
        long listTest = System.currentTimeMillis() - listOne;

        System.out.println("Map index: " + mapTest);
        System.out.println("List index: " + listTest);
    }
}