Java Constructor

class Add
{

int add (int x , int y)
{
return (x+y);
}

}

class FloatAdd extends Add
{

float add(float x, float y)
{
return (x+y);
}

}
class Test
{

public static void main(String [] args)
{
Add a = new Add();
FloatAdd addObj = (FloatAdd) a;
System.out.println("Result : "+addObj.add(10, 20));
}

}

What would be output?