Java 8. What is cost of lambdas ?

I like the lambdas. From c# of course, but now is possible to use lambdas also in Java 8.
But what is performance ?

1. Compare short list of strings with comparator defined as class
2. Compare short list of strings with comparator defined as anonymous class
3. Compare short list of strings with comparator defined as lambda

Results:

1. 47563
2. 78857
3. 111320

So lambda comparator is  2.34 time slower than comparator defined by class, and 1.65 times slower than comparator defined by anonymous class.

And here is code:

package com.company;

import java.util.*;

public class Main {

    public static void main(String[] args) {

        CompareByClass();

        CompareByLambda();

        CompareByAnonymous();
    }
    private static void CompareByClass() {
        List<String> names = Arrays.asList("peter", "anna", "mike", "xenia");
        Date timeStart = new Date();
        for(int i=0; i<Integer.MAX_VALUE;i++) {
            Collections.sort(names, new myComparator());
        }
        Date timeStop = new Date();
        System.out.println(timeStop.getTime() - timeStart.getTime());
    }

    private static void CompareByAnonymous() {
        List<String> names = Arrays.asList("peter", "anna", "mike", "xenia");
        Date timeStart = new Date();
        for(int i=0; i<Integer.MAX_VALUE;i++) {
            Collections.sort(names, new Comparator<String>() {
                @Override
                public int compare(String a, String b) {
                    return b.compareTo(a);
                }
            });
        }
        Date timeStop = new Date();
        System.out.println(timeStop.getTime() - timeStart.getTime());
    }

    private static void CompareByLambda() {
        List<String> names = Arrays.asList("peter", "anna", "mike", "xenia");
        Date timeStart = new Date();
        for(int i=0; i<Integer.MAX_VALUE;i++) {
            Collections.sort(names, (String a, String b) -> b.compareTo(a));
        }
        Date timeStop = new Date();
        System.out.println(timeStop.getTime() - timeStart.getTime());
    }
}

package com.company;

import java.util.Comparator;

public class myComparator implements Comparator<String>
{
    public int compare(String a, String b) {
        return b.compareTo(a);
    }
}