Objective-C Header and Class Implementation

Person.h

#import <Foundation/Foundation.h>

@interface Person:NSObject{

   NSString *name;

   int age;

}

- (NSString *)name;

- (void) setName: (NSString *) newName;

- (int)age;

- (void) setAge: (int) newAge;

//actions

- (BOOL) isAllowedToVote;

- (void castBallot;

@end

Person.m

#import "Person.h"

@implementation Person

- (int) age{

   return age;

}

- (void) setAge: (int) value{

   age = value;

}

//... and other methods

@end

Using a class

id anObject = [[SomeClass alloc] init];

- (id) init

{

   self = [super init];

   if(self){

     //initializations

   }

   return self;

}

- (Person *) createPersonWithName: (NSString *) aName{

   Person *aPerson = [[Person alloc] init];

   [aPerson setName:aName];

   [aPerson setAge:21];

   return aPerson;

}

Class Inheritance

@interface Student : Person {

   NSString *major;

}

@end

@implementation Student

// Constructor for a student

- (id) init

{

   self = [super init];

   if(self != nil){

      //set attributes

      [self setMajor:@"Undefined"];

   }

   return self;

}

@end