reflect.m

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


    NSString *str = @"hello";
    NSLog(@"%@", [str uppercaseString]);
    NSLog(@"%@", [str performSelector:@selector(uppercaseString)]);
    NSLog(@"%@", [str performSelector:NSSelectorFromString(@"uppercaseString")]);

    [pool release];
    return 0;
}