NSMutableArray Add/Remove Objects (Inherited File) - nsmutablearray

Question

Okay, so I'm pretty new to xcode but I cannot find something specific to this issue anywhere. So I declare the array and instantiate it in the following files:
//xmlToUrl.h
#import <Foundation/Foundation.h>
#interface xmlToUrl : NSObject {
NSMutableArray *field;
NSMutableArray *name;
}
#property(nonatomic, retain)NSMutableArray *field;
#property(nonatomic, retain)NSMutableArray *name;
#end
and
//xmlToUrl.m
#import "xmlToUrl.h"
#implementation xmlToUrl
#synthesize field;
#synthesize name;
-(void)dealloc
{
[field release];
[name release];
[super dealloc];
}
#end
So this is where I am confused. I don't know how to correctly "alloc" or "init" the mutable arrays, nor how to handle the add/remove operations from another file which inherits xmlToUrl.h.
The code (in the other file) as I have it now just prints null. Its listed below. What am I doing wrong?!?
//nodeContent is just a NSMutableString
[xmlToUrlObject.name addObject:nodeContent];
NSLog(#"xml Name = %#", xmlToUrlObject.name);
//I omitted all the operational code here but if I NSLog nodeContent it prints the correct values
[xmlToUrlObject.field addObject:nodeContent];
NSLog(#"xml Field = %#", xmlToUrlObject.field);

Answer 1

You need an init function in your implementation file, it would look similar to the following
-(id) init
{
self = [super init];
if (self) {
field = [[NSMutableArray alloc] init];
name = [[NSMutableArray alloc] init];
}
return self;
}
Then whenever you create an instance of your xmlToUrl class via [[xmlToUrl alloc] init] you will have an instance of your class that has already initialized your two NSMutableArrays