Inheritance is a concept of deriving the features from one class to another class.
An inheritance leads to code reusability.
Inheritance also saves memory.
Observation
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Class EMP
{
P in temp no (or) Private int ENO;
Private String EName;
Private int Sal;
}
Class worker (wrk)
{
28 bytes
}
Class manager : wrk
{
12 bytes
}
Class A
{ }
Class B: A
{ }
Class A
{
P1 ()
}
Class B:A
{
P2 ()
}
Class A Base class
{
}
Class B: A derived class
{
}
Class C:B derived class
{
}
Class c : A, B
C obj = new c ()
Obj .P1 ()
Not possible (or) supported in .net.
Multiple inheritances is not supported directly in C #.net.
But a similar structure is supported with the help of Inheritance.
It is not supported
It contains multiple Inheritance
B obj = new B()
Private data is accessible only from the class where these are declared.
Protected data is accessible from ALL SUBCLASSES (derived class )also.
Class B : Private A -à C ++ Concept
Public data is accessible in the derived class as well as from objects
Ex 1:-
A company gives Bonus, when they are reaching the target, then calculate the total salary.
ENO
SAL
BONUS
%S (Total Salary)
Open windows forms application project Place a button Code in GD
Class EMP
{
Private int ENO = 101;
Protected int Sal = 5000;
Public void print ()
{
Message. Box. Show (E no + “” + Sal);
}
//print
}
// class (EMP)
Class bonus : EMP
{
Private int b, ts;
Public void calculate (int n)
{
B = n;
Print ();
Ts = Sal +b;
Message Box. Show (“Total” + ts);
}
}
//Bonus Code for
Button1_click
{
Dialog Result dr;
Dr = Message Box . show (“R u getting bonus”, “Peers”, Message Box Buttons. Yes No, Message Box Icon .Question );
If (dr = = Dialog Result .yes)
{
Bonus obj = new bonus ();
Obj. Calculate (3000);
}
Else {
EMP X = new EMP ();
print ();
}
(or) new EMP ().Print (); // name less object
}
Public void Print ()
{
MB.S (“A”)
}
Public void show ()
{
MB.S (“B”);
Print ();
}
B obj = new B ();
Obj. Show () Obj. Print ()
Overriding is a concept of having two methods with the same name and the same arguments in Base and derived classes.
In overriding by default the priority will be given to local class methods.
In overriding, in order to access parent class method s,
the “base” keyword is required. ”base” keyword can be used with methods, fields, and constructors also.
{
MBS (“A”);
}
{
MBS (“B”);
}
base. show ();
{
MBS (“C”);
}
base. Show ();
New c () .show ();
Example on overriding Fields
open window forms application project
place a button
code in GD
Class A
{
Public int x = 10;
}
Class B :A
{
Private int x = 100;
Public void print (int x)
{
Message Box. Show (This. x + “”) ;
//100
Message Box. Show (base. x + “”) ;
//10
Message Box. Show (This. x + “”) ;
//1000
}
}
Code for Button 1_click
{
B obj = new B ();
Obj. print (1000);
Message Box .Show (obj . x + “”);
//10
}
Sealed classes are not inheritable Sealed is a keyword When a class is providing full functionality as per the requirements, then recommended to declare that classes as “sealed class”
Open windows forms application project Place a button Code in GD Sealed
class test
{
Public void divide (Sting s)
{
String [] x = s. split (“”);
For (I =0; I < x. length; I ++)
Message Box. Show (x [i]);
}
// divide
Class abc : test
{
// gives an error
}
Code for Button1 _ click
Private void Button1_click (----)
{
Test t = new test ();
Divide (“this is for test”);
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