Java and .NET heap overhead

using System;

public class Foo
{
    int x;

    public Foo(int x)
    {
        this.x = x;
    }
}

public class Test
{
    static void Main(string[] args)
    {
        int length = int.Parse(args[0]);

        Foo x = new Foo(0);
        Foo[] array = new Foo[length];
        // Make sure that JITting the string constructor doesn't
        // change things
        long start = GC.GetTotalMemory(true);
        for (int i=0; i < length; i++)
        {
            array[i] = new Foo(i);
        }
        long end = GC.GetTotalMemory(true);

        GC.KeepAlive(array);
        GC.KeepAlive(x);

        decimal totalDecimal = end-start;
        Console.WriteLine(totalDecimal / length);
    }
}