Polymorphism

Question

if we declare one constructor in parent class and another constructor in child class

eg.
class A // parent class
{
public A()
{
Console.Writeline("I m in A");
}
}
class B : A // child class
{
public B()
{
Console.Writeline("I m in B ");
}
static void main(string[] args)
{
A a=new B();
}
}

output // I m in A
I m in B

In the above program why it is called both constructor ? explain

Answer 1

When a sub/child class is instantiate, it will first call the superclass (which is also base class/parent class) constructor, then follow by the sub class' constructor. This can easily remembered and logic as you need the "base"(base class) before you can do anything more (sub class)

Answer 2

Btw, this is true for Java, not sure for other languages...

Answer 3

thank you