Person.h

#import <Foundation/Foundation.h>

@interface Person : NSObject {
    NSString *screenName;
    NSString *realName;
    NSURL *imageURL;
}

@property (nonatomic, retain) NSString *screenName;
@property (nonatomic, retain) NSString *realName;
@property (nonatomic, retain) NSURL *imageURL;

- (id)initWithScreenName:(NSString *)sn
    realName:(NSString *)rn
    imageURLString:(NSString *)imageUrlStr;

@end

Person.m

#import "Person.h"

@implementation Person

@synthesize screenName;
@synthesize realName;
@synthesize imageURL;


- (id)initWithScreenName:(NSString *)sn
    realName:(NSString *)rn
    imageURLString:(NSString *)imageUrlStr;
{
    if ( (self = [super init]) == nil)
        return nil;


    self.screenName = sn;

    self.realName = rn;

    NSURL *url = [[NSURL alloc] initWithString:imageUrlStr];
    self.imageURL = url;
    [url release];


    return self;
}


- (void)dealloc;
{
    [super dealloc];
    [screenName release];
    [realName release];
    [imageURL release];
}


@end

test.m

#import <Foundation/Foundation.h>
#import "Person.h"

int main(void)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];

    NSMutableArray *array = [[NSMutableArray alloc] init];
    [array autorelease];


    Person *p1 = [[Person alloc] initWithScreenName:@"dude1"
        realName:@"Joe Dude" imageURLString:@"http://somewhere.com/dude1.jpg"];
    Person *p2 = [[Person alloc] initWithScreenName:@"dude2"
        realName:@"John Dude" imageURLString:@"http://somewhere.com/dude2.jpg"];
    Person *p3 = [[Person alloc] initWithScreenName:@"dudette3"
        realName:@"Jane Dudette" imageURLString:@"http://somewhere.com/dudette3.jpg"];

    [array addObject:p1];
    [array addObject:p2];
    [array addObject:p3];

    [p1 release];
    [p2 release];
    [p3 release];

    Person *object = [array objectAtIndex:1];

    NSLog(@"The second object in the array is %@", object.realName);

    [pool release];
}