Sealed Classes
If class is declared as sealed using sealed modifier it cant be inherited by any
other class but can be still be consume by creating its object
Seale class class1
{
members
}
Class Class2:class1//invalid
Sealed method
Method which cant be overridden under child classes is known as sealed methods
by default every method in class is sealed because overridden of method is not
possible unless it is declared as virtual
If method was declared as virtual in class any of its child class hierarchy has
a chance to override method
Class1
Public virtual void show ()
Classs2:class1
Public override void show ()
Classs3:class2
Public override void show ()
If at all child class wants to restrict its child classes not to override
virtual methods of its parent it can restrict it by declaring methods as sealed
while overriding it
Class1
Public virtual void show ()
Class2:class1
Public sealed override void show ()
Classs3:class2
Public override void show ()//invalid