How to compare if two objects are really the same object?

Question

I want to compare if an variable A represents the same object as variable B does.

Could I do that with the == operator?

Or what else is this exactly looking

Answer 1

The == tells you if two pointers are pointing to the same object. isEqual tells you if the contents of two objects are the same (but not necessarily the actual same object). A little confusing.

Try this code to understand it better:

NSString *aString = [NSString stringWithFormat:@"Hello"];
NSString *bString = aString;
NSString *cString = [NSString stringWithFormat:@"Hello"];

if (aString == bString)
    NSLog(@"CHECK 1");

if (bString == cString)
    NSLog(@"CHECK 2");

if ([aString isEqual:bString])
    NSLog(@"CHECK 3");

if ([bString isEqual:cString])
    NSLog(@"CHECK 4");

// Look at the pointers:
NSLog(@"%p", aString);
NSLog(@"%p", bString);
NSLog(@"%p", cString);