interface implementation with another interface

interface a:i
{
public void methoda();

}

class Program:a
{
static void Main(string[] args)
{
a obj1 = new Program();
obj1.method1();
Console.ReadLine();
}

void method1()
{
Console.WriteLine("methods1interface");
}
void methoda()
{
Console.WriteLine("methods1interface");
}

}
}