是什么增加了对象的保留计数？

Here is code I am referring to.

这是我指的代码。

// Person.h

@interface Person : NSObject {
    NSString *firstName;
    NSString *lastName;
}
@end

// Person.m

@implementation Person
- (id)init {
    if (![super init]) return nil;
    firstName = @"John";
    lastName = @"Doe";
}
@end

// MyClass.m

@implementation MyClass
    .....
- (NSArray *)getPeople {
    NSMutableArray *array = [[NSMutableArray alloc] init];

    int i;
    for (i = 0; i < 10; i++) {
        Person *p = [[Person alloc] init];
        [array addObject:p];
    }

    return array;
}
    .....
@end
//