Creating a method in derived
class with same signature as a method in base class is called as method
overriding.
Same signature means methods
must have same name, same number of arguments and same type of arguments.
Method overriding is possible only in derived classes, but not within the same class.
When derived class needs a method with same signature as in base class, but wants to execute different code than provided by base class then method overriding will be used.
To allow the derived class to override a method of the base class, C# provides two options,virtual methods and abstract methods.
Examples for Method Overriding in C#
Method overriding is possible only in derived classes, but not within the same class.
When derived class needs a method with same signature as in base class, but wants to execute different code than provided by base class then method overriding will be used.
To allow the derived class to override a method of the base class, C# provides two options,virtual methods and abstract methods.
Examples for Method Overriding in C#
using System;
namespace methodoverriding
{
class BaseClass
{
public virtual string
YourCity()
{
return "New York";
}
}
class DerivedClass : BaseClass
{
public override string YourCity()
{
return "London";
}
}
class Program
{
static void Main(string[] args)
{
DerivedClass obj = new
DerivedClass();
string city = obj.YourCity();
Console.WriteLine(city);
Console.Read();
}
}
}
|
Output
London
|
Example - 2 implementing abstract method
using
System;
namespace
methodoverridingexample
{
abstract class BaseClass
{
public abstract string YourCity();
}
class DerivedClass : BaseClass
{
public override string
YourCity() //It is mandatory to
implement absract method
{
return "London";
}
private int sum(int a, int b)
{
return a + b;
}
}
class Program
{
static void Main(string[] args)
{
DerivedClass obj = new
DerivedClass();
string city = obj.YourCity();
Console.WriteLine(city);
Console.Read();
}
}
}
|
Output
London
|
No comments:
Post a Comment