0 1 00:00:00,221 --> 00:00:06,401 So back to our vehicle here as you can see since the brand is 1 2 00:00:06,401 --> 00:00:11,201 read only we cannot update it from inside of our class. But 2 3 00:00:11,201 --> 00:00:14,001 we did that because outside of the class we don't want to be 3 4 00:00:14,001 --> 00:00:21,541 able to do something like this. Honda.brand equal Toyota 4 5 00:00:21,541 --> 00:00:25,581 okay and that's that's working okay we we cannot do it but 5 6 00:00:25,581 --> 00:00:29,701 this is problematic so what you can do instead of using read 6 7 00:00:29,701 --> 00:00:34,261 only you could use the keyword for example private means 7 8 00:00:34,261 --> 00:00:39,621 basically this variable is now completely managed by the class 8 9 00:00:39,621 --> 00:00:46,261 only and cannot be updated or accessed in read or in write 9 10 00:00:46,261 --> 00:00:49,781 outside of the class so now you're going to notice that if 10 11 00:00:49,781 --> 00:00:53,221 I do honda dot, well you cannot see anymore brand it's only 11 12 00:00:53,221 --> 00:00:56,881 private you cannot see it from outside okay so it appear 12 13 00:00:56,881 --> 00:01:02,081 completely from the object but if you're inside your class for 13 14 00:01:02,081 --> 00:01:05,761 example here as you can see I still have brand and speed okay 14 15 00:01:05,761 --> 00:01:10,161 I can access all of that so the private keyword is used when 15 16 00:01:10,161 --> 00:01:14,081 you want to use and manage a variable or function or 16 17 00:01:14,081 --> 00:01:18,961 anything on the inside the class okay but you also have 17 18 00:01:18,961 --> 00:01:23,361 the keyword public okay so by default everything is public so 18 19 00:01:23,361 --> 00:01:25,841 when it's public it means that you can access it from the 19 20 00:01:25,841 --> 00:01:31,501 inside and from the outside so if I go so if I go honda dot as 20 21 00:01:31,501 --> 00:01:34,941 you can see brand is here okay but be careful because 21 22 00:01:34,941 --> 00:01:38,301 something that is public can be updated and that is pretty 22 23 00:01:38,301 --> 00:01:42,301 dangerous okay we want to only be able to update it through 23 24 00:01:42,301 --> 00:01:48,621 set brand so it will be way better to use private on brand 24 25 00:01:48,621 --> 00:01:52,701 now I cannot update brand but set brand is public by default 25 26 00:01:52,701 --> 00:01:56,701 okay I can write it if you want public and this way the only 26 27 00:01:56,701 --> 00:02:01,441 way to update honda is to do a set brand and now I can do 27 28 00:02:01,441 --> 00:02:13,141 something like this. And I can log my brand. Oh obviously I 28 29 00:02:13,141 --> 00:02:16,581 can't okay I cannot read my brand so if you want to read 29 30 00:02:16,581 --> 00:02:20,181 your brand then you will have to create a function that is 30 31 00:02:20,181 --> 00:02:27,221 public for example get brand like this and just return this 31 32 00:02:27,221 --> 00:02:30,501 dot brand like this and so obviously I'm going to say that 32 33 00:02:30,501 --> 00:02:36,461 this is returning a string and instead of doing that, I'm 33 34 00:02:36,461 --> 00:02:44,101 going to do a get brand. And yes it's working so that's the 34 35 00:02:44,101 --> 00:02:46,981 difference between private and public okay private it's only 35 36 00:02:46,981 --> 00:02:51,781 for the class to manage and public anyone can manage it but 36 37 00:02:51,781 --> 00:02:55,541 you also have static I don't know if you know this one so 37 38 00:02:55,541 --> 00:02:58,101 static 38 39 00:02:58,721 --> 00:03:05,701 For example, color, okay, that could be a string as well. So 39 40 00:03:05,701 --> 00:03:10,421 static means that you can use this variable modify it read 40 41 00:03:10,421 --> 00:03:14,661 from it without even having to create an instance of the glass 41 42 00:03:14,661 --> 00:03:19,061 okay so even without having to do a new something and store it 42 43 00:03:19,061 --> 00:03:23,701 somewhere okay so it means that basically I could for example 43 44 00:03:23,701 --> 00:03:26,741 set a default value for my color I don't know black like 44 45 00:03:26,741 --> 00:03:32,581 this and now even if I don't have any vehicle at all I can 45 46 00:03:32,581 --> 00:03:38,641 just do this vehicle dot color and as you can see that's the 46 47 00:03:38,641 --> 00:03:43,961 only one that I can access okay color because it's static and 47 48 00:03:43,961 --> 00:03:47,921 as you can see yeah I can access the color so you don't 48 49 00:03:47,921 --> 00:03:52,481 even need to to create an instance out of it okay so it's 49 50 00:03:52,481 --> 00:03:57,041 sometimes useful for example if you create a function like I I 50 51 00:03:57,041 --> 00:04:01,281 often do when I create an API so for example I create 51 52 00:04:01,281 --> 00:04:08,821 something like this a class for example vehicle API and then 52 53 00:04:08,821 --> 00:04:11,141 inside I'm going to create a static function that is going 53 54 00:04:11,141 --> 00:04:17,621 to be fetch all and then inside I'm going to do an asynchronous 54 55 00:04:17,621 --> 00:04:22,161 request for example. Oh you don't have to write function 55 56 00:04:22,161 --> 00:04:27,281 sorry and well I don't want to have to do something like this 56 57 00:04:27,281 --> 00:04:30,321 anytime I want to use my API you know I don't want to do 57 58 00:04:30,321 --> 00:04:38,321 vehicle API equal new vehicle API etcetera etcetera and then 58 59 00:04:38,321 --> 00:04:43,281 finally do a vehicle API dot fetchAll okay I want to be 59 60 00:04:43,281 --> 00:04:49,361 able to just use my vehicle API like this instantly okay so 60 61 00:04:49,361 --> 00:04:54,761 that's an example of when could use static. Alright so that is 61 62 00:04:54,761 --> 00:04:58,121 pretty much about the accessor so private, public and static. 62 63 00:04:58,121 --> 00:05:00,681 There is another one that is predicted but we will see this 63 64 00:05:00,681 --> 00:05:03,961 one later in the course. All right so see you in the next 64 65 00:05:03,961 --> 00:05:07,161 one. I hope it was clear.