Sort comparison

package by.defascat.saved;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.List;
import java.util.Random;
import java.util.stream.Collectors;

/**
 *
 * @author andy
 */
public class SortingEx {

    public static void main(String[] args) {
        List<O> al = new ArrayList<>();
        List<O> al2 = new ArrayList<>();
        new Random().ints(1000000).forEach(i -> al.add(new O(i)));
        al2.addAll(al);

        long time1 = System.currentTimeMillis();
        al.stream().sorted(Comparator
                .comparing(O::getA)
                .thenComparing(O::getB)
                .thenComparing(O::getC)
                .thenComparing(O::getD)
        )
                .collect(Collectors.toList());
        long time2 = System.currentTimeMillis();
        al.stream().sorted(Comparator
                .comparingInt(O::getA)
                .thenComparingInt(O::getB)
                .thenComparingInt(O::getC)
                .thenComparingInt(O::getD)
        )
                .collect(Collectors.toList());

        long time3 = System.currentTimeMillis();

        Collections.sort(al2);

        long time4 = System.currentTimeMillis();

        System.out.println("Time 1: " + (time2 - time1) + "; Time 2: " + (time3 - time2) + "; Time 3: " + (time4 - time3));
    }

    static class O implements Comparable<O> {

        private final int a;
        private final int b;
        private final int c;
        private final int d;

        public O(int i) {
            a = i % 2;
            b = i % 10;
            c = i % 100;
            d = i;
        }

        public int getA() {
            return a;
        }

        public int getB() {
            return b;
        }

        public int getC() {
            return c;
        }

        public int getD() {
            return d;
        }

        @Override
        public int compareTo(O o) {
            int comp = Integer.compare(getA(), o.getA());
            if (comp == 0) {
                comp = Integer.compare(getB(), o.getB());
                if (comp == 0) {
                    comp = Integer.compare(getC(), o.getC());
                    if (comp == 0) {
                        comp = Integer.compare(getD(), o.getD());
                    }
                }
            }
            return comp;
        }

    }
}