Adding an object to a NSMutablearray doesn't work properly - objective-c

Question

I have a situation where in a loop I'm trying to add an object to a NSMutableArray. At the end of the loop it is showing that 54 objects (as an example) are added to the array but when I'm trying to read the objects from the array, apparently they are all the same as each other and same as the last object that is inserted into the array.
Could anyone please help me with this issue.This is my code:
int counter=0;
for (int j=0; j<rows; j++)
{
Product *product ;
product = [[Product alloc] init];
int numberr= [product getImageNumber];
[wineList addObject:product];
counter = counter + 1;
}
After adding the objects,I'm testing the content of the array which I'm getting the same result for each item in the array
//testing
Product *producttest1 = wineList[1];
int numbertest1= [producttest1 getImageNumber];
Product *producttest2 = wineList[20];
int numbertest2= [producttest2 getImageNumber];
This is the definition of the Product class that I have :
#import "Product.h"
#implementation Product
int imageNumber;
bool isInCase;
-(id) init {
imageNumber = (arc4random() % 11) + 1;
isInCase = false;
return self;
}
-(int) getImageNumber {
return imageNumber;
}
-(void) setImageNumber:(int) number {
imageNumber = number;
}

Answer 1

Your -init method never initializes your class. Make a call to [super init].
-(id)init {
self = [super init];
if (self) {
imageNumber = (arc4random() % 11) + 1;
isInCase = false;
}
return self;
}

Answer 2

Your code should probably go like this,
int counter=0;
for (int j=0; j < rows; j++)
{
Product *product = [[Product alloc] init]; // Added variable declaration inside.
int numberr= [product getImageNumber];
[wineList addObject:product];
[product release]; // Added release for product
counter = counter + 1;
}