Object composition / Inheritance

// ÖRÖKLÉS (Inheritance):

class A {
    public void m1()
    {
       Console.Write("hello");
    }
}

class B : A
{
    public void m2()
    {
        m1();
    }
}

class Program
{
  static void Main(string[] a)
  {
        B b = new B();
        b.m2();
    }
}


////////////////////////////////////////////

// OBJEKTUMÖSSZETÉTEL (Object composition):

class A
{
    public void m1()
    {
       Console.Write("hello");
    }
}

class B
{
    A a = new A();
    public void m2()
     {
        a.m1();
    }
}

class Program
{
  static void Main(string[] a)
    {
        B b = new B();
        b.m2();
    }
}