Benchmark results with local variable and primitive array

import java.util.Map.Entry;

import Benchmark;
import Benchmark.Operation;
import Benchmark.Performance;

public class Main {

    public static void main(String[] args) throws Exception {
        Operation o1 = new Operation() {

            @Override
            public void run() {
                int[] a = new int[] { 1, 2 };
                boolean b = a instanceof int[];
            }

            @Override
            public String getId() {
                return "a instanceof int[]";
            }

        };
        Operation o2 = new Operation() {

            @Override
            public void run() {
                int[] a = new int[] { 1, 2 };
                boolean b = a.getClass().isArray();
            }

            @Override
            public String getId() {
                return "a.getClass().isArray()";
            }

        };
        Operation o3 = new Operation() {

            @Override
            public void run() {
                int[] a = new int[] { 1, 2 };
                boolean b = a.getClass().getName().charAt(0) == '[';
            }

            @Override
            public String getId() {
                return "a.getClass().getName().charAt(0) == '['";
            }

        };
        Benchmark b = new Benchmark(o1, o2, o3);
        b.setNestedLoopIterations(5000000);
        b.setMainLoopIterations(100);
        b.run();
        for (Entry<String, Performance> e : b.getPerformances().entrySet()) {
            System.out.println("{" + e.getKey() + "} spends " + e.getValue());
        }
    }

}