stream api, parallel processing

package ch.claude_martin;

import java.util.List;
import java.util.Set;
import java.util.concurrent.ConcurrentSkipListSet;
import java.util.stream.Collectors;
import java.util.stream.IntStream;

public class SomeClass {

    public static void main(String[] args) {
        List<String> list2 = IntStream.range(0, 100000).parallel().mapToObj(i -> process(i))
                .collect(Collectors.toList());

        System.out.println(list2.subList(0, 30));
        System.out.println(THREAD_NAMES);

    }

    final static Set<String> THREAD_NAMES = new ConcurrentSkipListSet<>();

    /**
     * Absurd implementation!
     *
     * @returns "even" or "odd"
     */
    static String process(int i) {
        THREAD_NAMES.add(Thread.currentThread().getName());
        String binary = Integer.toBinaryString(i);
        while (binary.length() > 1)
            binary = binary.substring(1);
        return binary.charAt(binary.length() - 1) == '0' ? "even" : "odd";
    }
}