Abstract class:
it contains mixure of concrete methods in the sense methods with body and some methods only names.
when a class contains an anstract method the class is called abstract class.to define an abstract method it uses "abstract" keyword.
if a class contains an abstract method then the class must be defined with "abstract" keyword.
to redefined an abstract method the derived class uses "override" keyword.
NOTE: AN ABSTRACT CLASS COULDN'T HAVE OBJECT REFERENCE WHY BECAUSE IT IS WITH SOME METHODS WITHOUT COMPLETION.
class Program
{
static void Main(string[] args)
{
MyClass c = new MyClass();
c.disp();
c.print();
Console.ReadLine();
}
}
//abstract class
abstract class MyAbstractClass
{
public void print()
{
Console.WriteLine("print method");
}
public abstract void disp();
}
//derived class
class MyClass:MyAbstractClass
{
public override void disp()
{
//throw new NotImplementedException();
Console.WriteLine("this is disp method");
}
}
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