Dynamic Binding in Objective C

Dynamic Binding In Objective C

Before going to this tutorial I come up with suggestion that read my previous tutorial of Polymorhism

Wanna Read Link is here:Polymorphism in Objective C

Let come to this tutorial of Dynamic Binding. Dynamic Binding as name suggests it include message or method at run time. Compiler does not know information of invoking about it. Already Objective C invoke method at run time or dynamically.

In other words it can said that Dynamic Binding power the Polymorphism.

Example: Below is simple program you can expand your knowledge.

In Student.h

@interface Student:NSObject

{

NSString *studentname;

}
@property(nonatomic,strong)NSString *StudentName;

-(void)getStudentName:(NSString *)StudentName;

-(void)printName;

@end;

In Student.m

@implementation Student

@synthesize StudentName=_StudentName;

-(void)getStudentName:(NSString *)StudentName

{

studentname=StudentName;

}

-(void)printName

{

NSLog(@”The name of student is:%@”,studentname);

}

@end

In Teacher.h

@interface Teacher:NSObject

{

NSString *teachername;

}
@propertyonatomic,strong)NSString *TeacherName;

-(void)getTeacherName:(NSString *)TeacherName;

-(void)printName;

@end;

In Teacher.m

@implementation Teacher
@synthesize TeacherName=_TeacherName;

-(void)getTeacherName:(NSString *)TeacherName;

{

teachername=TeacherName;

}

-(void)printName

{

NSLog(@”The name of Teacher is:%@”,teachername);

}

In main section

Int main(int argc, const *argv[])

{

NSAutorealesePool *pool=[[NSAutorealesePool alloc]init];

Student student1=[[Student alloc]init];

[student1 getStudentName:@”abc”];

Teacher teacher1=[[Teacher alloc]init];

[teacher1 getTeacherName:@”Suraj”];

NSArray *ComputerScience=[[NSArray alloc]initWithObjects:student1,teacher1,nil];

Id *computerscience1=[ComputerScience objectAtIndex:0];

[computerscience1 printStudentName];

Id *computerscience2=[ComputerScience objectAtIndex:1];

[computerscience2 printName];

Return 0;

}

In above program after creating array checking of object for method is done at run time with appropriate content is printed.
I write this tutorial after keeping in mind you know already about id data type. 
If you want to study about it click here : id data type

I hope you like my tutorial.If any kind of query after reading this tutorial in you mind you can comment here and can mail me.

My next tutorial will be about Category in Objective C.